API: datatable DataTable.js (YUI Library)

# Yahoo! UI Library

### DataTable Widget 2.9.0

Yahoo! UI Library > datatable > DataTable.js (source view)
Search:
Filters Show Private Show Protected Show Deprecated

    (function () {

    var lang   = YAHOO.lang,
        util   = YAHOO.util,
        widget = YAHOO.widget,
        ua     = YAHOO.env.ua,

        Dom    = util.Dom,
        Ev     = util.Event,
        DS     = util.DataSourceBase;

    /**
     * The DataTable widget provides a progressively enhanced DHTML control for
     * displaying tabular data across A-grade browsers.
     *
     * @module datatable
     * @requires yahoo, dom, event, element, datasource
     * @optional dragdrop, dragdrop
     * @title DataTable Widget
     */

    /****************************************************************************/
    /****************************************************************************/
    /****************************************************************************/

    /**
     * DataTable class for the YUI DataTable widget.
     *
     * @namespace YAHOO.widget
     * @class DataTable
     * @extends YAHOO.util.Element
     * @constructor
     * @param elContainer {HTMLElement} Container element for the TABLE.
     * @param aColumnDefs {Object[]} Array of object literal Column definitions.
     * @param oDataSource {YAHOO.util.DataSource} DataSource instance.
     * @param oConfigs {object} (optional) Object literal of configuration values.
     */
    YAHOO.widget.DataTable = function(elContainer,aColumnDefs,oDataSource,oConfigs) {
        var DT = widget.DataTable;

        ////////////////////////////////////////////////////////////////////////////
        // Backward compatibility for SDT, but prevent infinite loops

        if(oConfigs && oConfigs.scrollable) {
            return new YAHOO.widget.ScrollingDataTable(elContainer,aColumnDefs,oDataSource,oConfigs);
        }

        ////////////////////////////////////////////////////////////////////////////
        // Initialization

        // Internal vars
        this._nIndex = DT._nCount;
        this._sId = Dom.generateId(null, "yui-dt");// "yui-dt"+this._nIndex;
        this._oChainRender = new YAHOO.util.Chain();
        this._oChainRender.subscribe("end",this._onRenderChainEnd, this, true);

        // Initialize configs
        this._initConfigs(oConfigs);

        // Initialize DataSource
        this._initDataSource(oDataSource);
        if(!this._oDataSource) {
            YAHOO.log("Could not instantiate DataTable due to an invalid DataSource", "error", this.toString());
            return;
        }

        // Initialize ColumnSet
        this._initColumnSet(aColumnDefs);
        if(!this._oColumnSet) {
            YAHOO.log("Could not instantiate DataTable due to an invalid ColumnSet", "error", this.toString());
            return;
        }

        // Initialize RecordSet
        this._initRecordSet();
        if(!this._oRecordSet) {
        }

        // Initialize Attributes
        DT.superclass.constructor.call(this, elContainer, this.configs);

        // Initialize DOM elements
        var okDom = this._initDomElements(elContainer);
        if(!okDom) {
            YAHOO.log("Could not instantiate DataTable due to an invalid DOM element", "error", this.toString());
            return;
        }

        // Show message as soon as config is available
        this.showTableMessage(this.get("MSG_LOADING"), DT.CLASS_LOADING);

        ////////////////////////////////////////////////////////////////////////////
        // Once per instance
        this._initEvents();

        DT._nCount++;
        DT._nCurrentCount++;

        ////////////////////////////////////////////////////////////////////////////
        // Data integration

        // Send a simple initial request
        var oCallback = {
            success : this.onDataReturnSetRows,
            failure : this.onDataReturnSetRows,
            scope   : this,
            argument: this.getState()
        };

        var initialLoad = this.get("initialLoad");
        if(initialLoad === true) {
            this._oDataSource.sendRequest(this.get("initialRequest"), oCallback);
        }
        // Do not send an initial request at all
        else if(initialLoad === false) {
            this.showTableMessage(this.get("MSG_EMPTY"), DT.CLASS_EMPTY);
        }
        // Send an initial request with a custom payload
        else {
            var oCustom = initialLoad || {};
            oCallback.argument = oCustom.argument || {};
            this._oDataSource.sendRequest(oCustom.request, oCallback);
        }
    };

    var DT = widget.DataTable;

    /////////////////////////////////////////////////////////////////////////////
    //
    // Public constants
    //
    /////////////////////////////////////////////////////////////////////////////

    lang.augmentObject(DT, {

        /**
         * Class name assigned to outer DataTable container.
         *
         * @property DataTable.CLASS_DATATABLE
         * @type String
         * @static
         * @final
         * @default "yui-dt"
         */
        CLASS_DATATABLE : "yui-dt",

        /**
         * Class name assigned to liner DIV elements.
         *
         * @property DataTable.CLASS_LINER
         * @type String
         * @static
         * @final
         * @default "yui-dt-liner"
         */
        CLASS_LINER : "yui-dt-liner",

        /**
         * Class name assigned to display label elements.
         *
         * @property DataTable.CLASS_LABEL
         * @type String
         * @static
         * @final
         * @default "yui-dt-label"
         */
        CLASS_LABEL : "yui-dt-label",

        /**
         * Class name assigned to messaging elements.
         *
         * @property DataTable.CLASS_MESSAGE
         * @type String
         * @static
         * @final
         * @default "yui-dt-message"
         */
        CLASS_MESSAGE : "yui-dt-message",

        /**
         * Class name assigned to mask element when DataTable is disabled.
         *
         * @property DataTable.CLASS_MASK
         * @type String
         * @static
         * @final
         * @default "yui-dt-mask"
         */
        CLASS_MASK : "yui-dt-mask",

        /**
         * Class name assigned to data elements.
         *
         * @property DataTable.CLASS_DATA
         * @type String
         * @static
         * @final
         * @default "yui-dt-data"
         */
        CLASS_DATA : "yui-dt-data",

        /**
         * Class name assigned to Column drag target.
         *
         * @property DataTable.CLASS_COLTARGET
         * @type String
         * @static
         * @final
         * @default "yui-dt-coltarget"
         */
        CLASS_COLTARGET : "yui-dt-coltarget",

        /**
         * Class name assigned to resizer handle elements.
         *
         * @property DataTable.CLASS_RESIZER
         * @type String
         * @static
         * @final
         * @default "yui-dt-resizer"
         */
        CLASS_RESIZER : "yui-dt-resizer",

        /**
         * Class name assigned to resizer liner elements.
         *
         * @property DataTable.CLASS_RESIZERLINER
         * @type String
         * @static
         * @final
         * @default "yui-dt-resizerliner"
         */
        CLASS_RESIZERLINER : "yui-dt-resizerliner",

        /**
         * Class name assigned to resizer proxy elements.
         *
         * @property DataTable.CLASS_RESIZERPROXY
         * @type String
         * @static
         * @final
         * @default "yui-dt-resizerproxy"
         */
        CLASS_RESIZERPROXY : "yui-dt-resizerproxy",

        /**
         * Class name assigned to CellEditor container elements.
         *
         * @property DataTable.CLASS_EDITOR
         * @type String
         * @static
         * @final
         * @default "yui-dt-editor"
         */
        CLASS_EDITOR : "yui-dt-editor",

        /**
         * Class name assigned to CellEditor container shim.
         *
         * @property DataTable.CLASS_EDITOR_SHIM
         * @type String
         * @static
         * @final
         * @default "yui-dt-editor-shim"
         */
        CLASS_EDITOR_SHIM : "yui-dt-editor-shim",

        /**
         * Class name assigned to paginator container elements.
         *
         * @property DataTable.CLASS_PAGINATOR
         * @type String
         * @static
         * @final
         * @default "yui-dt-paginator"
         */
        CLASS_PAGINATOR : "yui-dt-paginator",

        /**
         * Class name assigned to page number indicators.
         *
         * @property DataTable.CLASS_PAGE
         * @type String
         * @static
         * @final
         * @default "yui-dt-page"
         */
        CLASS_PAGE : "yui-dt-page",

        /**
         * Class name assigned to default indicators.
         *
         * @property DataTable.CLASS_DEFAULT
         * @type String
         * @static
         * @final
         * @default "yui-dt-default"
         */
        CLASS_DEFAULT : "yui-dt-default",

        /**
         * Class name assigned to previous indicators.
         *
         * @property DataTable.CLASS_PREVIOUS
         * @type String
         * @static
         * @final
         * @default "yui-dt-previous"
         */
        CLASS_PREVIOUS : "yui-dt-previous",

        /**
         * Class name assigned next indicators.
         *
         * @property DataTable.CLASS_NEXT
         * @type String
         * @static
         * @final
         * @default "yui-dt-next"
         */
        CLASS_NEXT : "yui-dt-next",

        /**
         * Class name assigned to first elements.
         *
         * @property DataTable.CLASS_FIRST
         * @type String
         * @static
         * @final
         * @default "yui-dt-first"
         */
        CLASS_FIRST : "yui-dt-first",

        /**
         * Class name assigned to last elements.
         *
         * @property DataTable.CLASS_LAST
         * @type String
         * @static
         * @final
         * @default "yui-dt-last"
         */
        CLASS_LAST : "yui-dt-last",

        /**
         * Class name assigned to Record elements.
         *
         * @property DataTable.CLASS_REC
         * @type String
         * @static
         * @final
         * @default "yui-dt-rec"
         */
        CLASS_REC : "yui-dt-rec",

        /**
         * Class name assigned to even elements.
         *
         * @property DataTable.CLASS_EVEN
         * @type String
         * @static
         * @final
         * @default "yui-dt-even"
         */
        CLASS_EVEN : "yui-dt-even",

        /**
         * Class name assigned to odd elements.
         *
         * @property DataTable.CLASS_ODD
         * @type String
         * @static
         * @final
         * @default "yui-dt-odd"
         */
        CLASS_ODD : "yui-dt-odd",

        /**
         * Class name assigned to selected elements.
         *
         * @property DataTable.CLASS_SELECTED
         * @type String
         * @static
         * @final
         * @default "yui-dt-selected"
         */
        CLASS_SELECTED : "yui-dt-selected",

        /**
         * Class name assigned to highlighted elements.
         *
         * @property DataTable.CLASS_HIGHLIGHTED
         * @type String
         * @static
         * @final
         * @default "yui-dt-highlighted"
         */
        CLASS_HIGHLIGHTED : "yui-dt-highlighted",

        /**
         * Class name assigned to hidden elements.
         *
         * @property DataTable.CLASS_HIDDEN
         * @type String
         * @static
         * @final
         * @default "yui-dt-hidden"
         */
        CLASS_HIDDEN : "yui-dt-hidden",

        /**
         * Class name assigned to disabled elements.
         *
         * @property DataTable.CLASS_DISABLED
         * @type String
         * @static
         * @final
         * @default "yui-dt-disabled"
         */
        CLASS_DISABLED : "yui-dt-disabled",

        /**
         * Class name assigned to empty indicators.
         *
         * @property DataTable.CLASS_EMPTY
         * @type String
         * @static
         * @final
         * @default "yui-dt-empty"
         */
        CLASS_EMPTY : "yui-dt-empty",

        /**
         * Class name assigned to loading indicatorx.
         *
         * @property DataTable.CLASS_LOADING
         * @type String
         * @static
         * @final
         * @default "yui-dt-loading"
         */
        CLASS_LOADING : "yui-dt-loading",

        /**
         * Class name assigned to error indicators.
         *
         * @property DataTable.CLASS_ERROR
         * @type String
         * @static
         * @final
         * @default "yui-dt-error"
         */
        CLASS_ERROR : "yui-dt-error",

        /**
         * Class name assigned to editable elements.
         *
         * @property DataTable.CLASS_EDITABLE
         * @type String
         * @static
         * @final
         * @default "yui-dt-editable"
         */
        CLASS_EDITABLE : "yui-dt-editable",

        /**
         * Class name assigned to draggable elements.
         *
         * @property DataTable.CLASS_DRAGGABLE
         * @type String
         * @static
         * @final
         * @default "yui-dt-draggable"
         */
        CLASS_DRAGGABLE : "yui-dt-draggable",

        /**
         * Class name assigned to resizeable elements.
         *
         * @property DataTable.CLASS_RESIZEABLE
         * @type String
         * @static
         * @final
         * @default "yui-dt-resizeable"
         */
        CLASS_RESIZEABLE : "yui-dt-resizeable",

        /**
         * Class name assigned to scrollable elements.
         *
         * @property DataTable.CLASS_SCROLLABLE
         * @type String
         * @static
         * @final
         * @default "yui-dt-scrollable"
         */
        CLASS_SCROLLABLE : "yui-dt-scrollable",

        /**
         * Class name assigned to sortable elements.
         *
         * @property DataTable.CLASS_SORTABLE
         * @type String
         * @static
         * @final
         * @default "yui-dt-sortable"
         */
        CLASS_SORTABLE : "yui-dt-sortable",

        /**
         * Class name assigned to ascending elements.
         *
         * @property DataTable.CLASS_ASC
         * @type String
         * @static
         * @final
         * @default "yui-dt-asc"
         */
        CLASS_ASC : "yui-dt-asc",

        /**
         * Class name assigned to descending elements.
         *
         * @property DataTable.CLASS_DESC
         * @type String
         * @static
         * @final
         * @default "yui-dt-desc"
         */
        CLASS_DESC : "yui-dt-desc",

        /**
         * Class name assigned to BUTTON elements and/or container elements.
         *
         * @property DataTable.CLASS_BUTTON
         * @type String
         * @static
         * @final
         * @default "yui-dt-button"
         */
        CLASS_BUTTON : "yui-dt-button",

        /**
         * Class name assigned to INPUT TYPE=CHECKBOX elements and/or container elements.
         *
         * @property DataTable.CLASS_CHECKBOX
         * @type String
         * @static
         * @final
         * @default "yui-dt-checkbox"
         */
        CLASS_CHECKBOX : "yui-dt-checkbox",

        /**
         * Class name assigned to SELECT elements and/or container elements.
         *
         * @property DataTable.CLASS_DROPDOWN
         * @type String
         * @static
         * @final
         * @default "yui-dt-dropdown"
         */
        CLASS_DROPDOWN : "yui-dt-dropdown",

        /**
         * Class name assigned to INPUT TYPE=RADIO elements and/or container elements.
         *
         * @property DataTable.CLASS_RADIO
         * @type String
         * @static
         * @final
         * @default "yui-dt-radio"
         */
        CLASS_RADIO : "yui-dt-radio",

        /////////////////////////////////////////////////////////////////////////
        //
        // Private static properties
        //
        /////////////////////////////////////////////////////////////////////////

        /**
         * Internal class variable for indexing multiple DataTable instances.
         *
         * @property DataTable._nCount
         * @type Number
         * @private
         * @static
         */
        _nCount : 0,

        /**
         * Internal class variable tracking current number of DataTable instances,
         * so that certain class values can be reset when all instances are destroyed.
         *
         * @property DataTable._nCurrentCount
         * @type Number
         * @private
         * @static
         */
        _nCurrentCount : 0,

        /**
         * Reference to the STYLE node that is dynamically created and updated
         * in order to manage Column widths.
         *
         * @property DataTable._elDynStyleNode
         * @type HTMLElement
         * @private
         * @static
         */
        _elDynStyleNode : null,

        /**
         * Set to true if _elDynStyleNode cannot be populated due to browser incompatibility.
         *
         * @property DataTable._bDynStylesFallback
         * @type boolean
         * @private
         * @static
         */
        _bDynStylesFallback : (ua.ie) ? true : false,

        /**
         * Object literal hash of Columns and their dynamically create style rules.
         *
         * @property DataTable._oDynStyles
         * @type Object
         * @private
         * @static
         */
        _oDynStyles : {},

        /////////////////////////////////////////////////////////////////////////
        //
        // Private static methods
        //
        /////////////////////////////////////////////////////////////////////////

        /**
         * Clones object literal or array of object literals.
         *
         * @method DataTable._cloneObject
         * @param o {Object} Object.
         * @private
         * @static
         */
        _cloneObject: function(o) {
            if(!lang.isValue(o)) {
                return o;
            }

            var copy = {};

            if(o instanceof YAHOO.widget.BaseCellEditor) {
                copy = o;
            }
            else if(Object.prototype.toString.apply(o) === "[object RegExp]") {
                copy = o;
            }
            else if(lang.isFunction(o)) {
                copy = o;
            }
            else if(lang.isArray(o)) {
                var array = [];
                for(var i=0,len=o.length;i<len;i++) {
                    array[i] = DT._cloneObject(o[i]);
                }
                copy = array;
            }
            else if(lang.isObject(o)) {
                for (var x in o){
                    if(lang.hasOwnProperty(o, x)) {
                        if(lang.isValue(o[x]) && lang.isObject(o[x]) || lang.isArray(o[x])) {
                            copy[x] = DT._cloneObject(o[x]);
                        }
                        else {
                            copy[x] = o[x];
                        }
                    }
                }
            }
            else {
                copy = o;
            }

            return copy;
        },

        /**
         * Formats a BUTTON element.
         *
         * @method DataTable.formatButton
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {HTML} Data value for the cell. By default, the value
         * is what gets written to the BUTTON. String values are treated as markup
         * and inserted into the DOM with innerHTML.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatButton : function(el, oRecord, oColumn, oData, oDataTable) {
            var sValue = lang.isValue(oData) ? oData : "Click";
            //TODO: support YAHOO.widget.Button
            //if(YAHOO.widget.Button) {

            //}
            //else {
                el.innerHTML = "<button type=\"button\" class=\""+
                        DT.CLASS_BUTTON + "\">" + sValue + "</button>";
            //}
        },

        /**
         * Formats a CHECKBOX element.
         *
         * @method DataTable.formatCheckbox
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {Object | Boolean | HTML} Data value for the cell. Can be a simple
         * Boolean to indicate whether checkbox is checked or not. Can be object literal
         * {checked:bBoolean, label:sLabel}. String values are treated as markup
         * and inserted into the DOM with innerHTML.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatCheckbox : function(el, oRecord, oColumn, oData, oDataTable) {
            var bChecked = oData;
            bChecked = (bChecked) ? " checked=\"checked\"" : "";
            el.innerHTML = "<input type=\"checkbox\"" + bChecked +
                    " class=\"" + DT.CLASS_CHECKBOX + "\" />";
        },

        /**
         * Formats currency. Default unit is USD.
         *
         * @method DataTable.formatCurrency
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {Number} Data value for the cell.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatCurrency : function(el, oRecord, oColumn, oData, oDataTable) {
            var oDT = oDataTable || this;
            el.innerHTML = util.Number.format(oData, oColumn.currencyOptions || oDT.get("currencyOptions"));
        },

        /**
         * Formats JavaScript Dates.
         *
         * @method DataTable.formatDate
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {Object} Data value for the cell, or null. String values are
         * treated as markup and inserted into the DOM with innerHTML.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatDate : function(el, oRecord, oColumn, oData, oDataTable) {
            var oDT = oDataTable || this,
                oConfig = oColumn.dateOptions || oDT.get("dateOptions");
            el.innerHTML = util.Date.format(oData, oConfig, oConfig.locale);
        },

        /**
         * Formats SELECT elements.
         *
         * @method DataTable.formatDropdown
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {Object} Data value for the cell, or null. String values may
         * be treated as markup and inserted into the DOM with innerHTML as element
         * label.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatDropdown : function(el, oRecord, oColumn, oData, oDataTable) {
            var oDT = oDataTable || this,
                selectedValue = (lang.isValue(oData)) ? oData : oRecord.getData(oColumn.field),
                options = (lang.isArray(oColumn.dropdownOptions)) ?
                    oColumn.dropdownOptions : null,

                selectEl,
                collection = el.getElementsByTagName("select");

            // Create the form element only once, so we can attach the onChange listener
            if(collection.length === 0) {
                // Create SELECT element
                selectEl = document.createElement("select");
                selectEl.className = DT.CLASS_DROPDOWN;
                selectEl = el.appendChild(selectEl);

                // Add event listener
                Ev.addListener(selectEl,"change",oDT._onDropdownChange,oDT);
            }

            selectEl = collection[0];

            // Update the form element
            if(selectEl) {
                // Clear out previous options
                selectEl.innerHTML = "";

                // We have options to populate
                if(options) {
                    // Create OPTION elements
                    for(var i=0; i<options.length; i++) {
                        var option = options[i];
                        var optionEl = document.createElement("option");
                        optionEl.value = (lang.isValue(option.value)) ?
                                option.value : option;
                        // Bug 2334323: Support legacy text, support label for consistency with DropdownCellEditor
                        optionEl.innerHTML = (lang.isValue(option.text)) ?
                                option.text : (lang.isValue(option.label)) ? option.label : option;
                        optionEl = selectEl.appendChild(optionEl);
                        if (optionEl.value == selectedValue) {
                            optionEl.selected = true;
                        }
                    }
                }
                // Selected value is our only option
                else {
                    selectEl.innerHTML = "<option selected value=\"" + selectedValue + "\">" + selectedValue + "</option>";
                }
            }
            else {
                el.innerHTML = lang.isValue(oData) ? oData : "";
            }
        },

        /**
         * Formats emails.
         *
         * @method DataTable.formatEmail
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {String} Data value for the cell, or null. Values are
         * HTML-escaped.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatEmail : function(el, oRecord, oColumn, oData, oDataTable) {
            if(lang.isString(oData)) {
                oData = lang.escapeHTML(oData);
                el.innerHTML = "<a href=\"mailto:" + oData + "\">" + oData + "</a>";
            }
            else {
                el.innerHTML = lang.isValue(oData) ? lang.escapeHTML(oData.toString()) : "";
            }
        },

        /**
         * Formats links.
         *
         * @method DataTable.formatLink
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {String} Data value for the cell, or null. Values are
         * HTML-escaped
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatLink : function(el, oRecord, oColumn, oData, oDataTable) {
            if(lang.isString(oData)) {
                oData = lang.escapeHTML(oData);
                el.innerHTML = "<a href=\"" + oData + "\">" + oData + "</a>";
            }
            else {
                el.innerHTML = lang.isValue(oData) ? lang.escapeHTML(oData.toString()) : "";
            }
        },

        /**
         * Formats numbers.
         *
         * @method DataTable.formatNumber
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {Object} Data value for the cell, or null.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatNumber : function(el, oRecord, oColumn, oData, oDataTable) {
            var oDT = oDataTable || this;
            el.innerHTML = util.Number.format(oData, oColumn.numberOptions || oDT.get("numberOptions"));
        },

        /**
         * Formats INPUT TYPE=RADIO elements.
         *
         * @method DataTable.formatRadio
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {Object} (Optional) Data value for the cell.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatRadio : function(el, oRecord, oColumn, oData, oDataTable) {
            var oDT = oDataTable || this,
                bChecked = oData;
            bChecked = (bChecked) ? " checked=\"checked\"" : "";
            el.innerHTML = "<input type=\"radio\"" + bChecked +
                    " name=\""+oDT.getId()+"-col-" + oColumn.getSanitizedKey() + "\"" +
                    " class=\"" + DT.CLASS_RADIO+ "\" />";
        },

        /**
         * Formats text strings.
         *
         * @method DataTable.formatText
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {String} (Optional) Data value for the cell. Values are
         * HTML-escaped.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatText : function(el, oRecord, oColumn, oData, oDataTable) {
            var value = (lang.isValue(oData)) ? oData : "";
            el.innerHTML = lang.escapeHTML(value.toString());
        },

        /**
         * Formats TEXTAREA elements.
         *
         * @method DataTable.formatTextarea
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {Object} (Optional) Data value for the cell. Values are
         * HTML-escaped.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatTextarea : function(el, oRecord, oColumn, oData, oDataTable) {
            var value = (lang.isValue(oData)) ? lang.escapeHTML(oData.toString()) : "",
                markup = "<textarea>" + value + "</textarea>";
            el.innerHTML = markup;
        },

        /**
         * Formats INPUT TYPE=TEXT elements.
         *
         * @method DataTable.formatTextbox
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {Object} (Optional) Data value for the cell. Values are
         * HTML-escaped.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatTextbox : function(el, oRecord, oColumn, oData, oDataTable) {
            var value = (lang.isValue(oData)) ? lang.escapeHTML(oData.toString()) : "",
                markup = "<input type=\"text\" value=\"" + value + "\" />";
            el.innerHTML = markup;
        },

        /**
         * Default cell formatter
         *
         * @method DataTable.formatDefault
         * @param el {HTMLElement} The element to format with markup.
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @param oColumn {YAHOO.widget.Column} Column instance.
         * @param oData {HTML} (Optional) Data value for the cell. String values are
         * treated as markup and inserted into the DOM with innerHTML.
         * @param oDataTable {YAHOO.widget.DataTable} DataTable instance.
         * @static
         */
        formatDefault : function(el, oRecord, oColumn, oData, oDataTable) {
            el.innerHTML = (lang.isValue(oData) && oData !== "") ? oData.toString() : "&#160;";
        },

        /**
         * Validates data value to type Number, doing type conversion as
         * necessary. A valid Number value is return, else null is returned
         * if input value does not validate.
         *
         *
         * @method DataTable.validateNumber
         * @param oData {Object} Data to validate.
         * @static
        */
        validateNumber : function(oData) {
            //Convert to number
            var number = oData * 1;

            // Validate
            if(lang.isNumber(number)) {
                return number;
            }
            else {
                YAHOO.log("Could not validate data " + lang.dump(oData) + " to type Number", "warn", this.toString());
                return undefined;
            }
        }
    });

    // Done in separate step so referenced functions are defined.
    /**
     * Registry of cell formatting functions, enables shortcut pointers in Column
     * definition formatter value (i.e., {key:"myColumn", formatter:"date"}).
     * @property DataTable.Formatter
     * @type Object
     * @static
     */
    DT.Formatter = {
        button   : DT.formatButton,
        checkbox : DT.formatCheckbox,
        currency : DT.formatCurrency,
        "date"   : DT.formatDate,
        dropdown : DT.formatDropdown,
        email    : DT.formatEmail,
        link     : DT.formatLink,
        "number" : DT.formatNumber,
        radio    : DT.formatRadio,
        text     : DT.formatText,
        textarea : DT.formatTextarea,
        textbox  : DT.formatTextbox,

        defaultFormatter : DT.formatDefault
    };

    lang.extend(DT, util.Element, {

    /////////////////////////////////////////////////////////////////////////////
    //
    // Superclass methods
    //
    /////////////////////////////////////////////////////////////////////////////

    /**
     * Implementation of Element's abstract method. Sets up config values.
     *
     * @method initAttributes
     * @param oConfigs {Object} (Optional) Object literal definition of configuration values.
     * @private
     */

    initAttributes : function(oConfigs) {
        oConfigs = oConfigs || {};
        DT.superclass.initAttributes.call(this, oConfigs);

        /**
        * @attribute summary
        * @description String value for the SUMMARY attribute.
        * @type String
        * @default ""
        */
        this.setAttributeConfig("summary", {
            value: "",
            validator: lang.isString,
            method: function(sSummary) {
                if(this._elTable) {
                    this._elTable.summary = sSummary;
                }
            }
        });

        /**
        * @attribute selectionMode
        * @description Specifies row or cell selection mode. Accepts the following strings:
        *    <dl>
        *      <dt>"standard"</dt>
        *      <dd>Standard row selection with support for modifier keys to enable
        *      multiple selections.</dd>
        *
        *      <dt>"single"</dt>
        *      <dd>Row selection with modifier keys disabled to not allow
        *      multiple selections.</dd>
        *
        *      <dt>"singlecell"</dt>
        *      <dd>Cell selection with modifier keys disabled to not allow
        *      multiple selections.</dd>
        *
        *      <dt>"cellblock"</dt>
        *      <dd>Cell selection with support for modifier keys to enable multiple
        *      selections in a block-fashion, like a spreadsheet.</dd>
        *
        *      <dt>"cellrange"</dt>
        *      <dd>Cell selection with support for modifier keys to enable multiple
        *      selections in a range-fashion, like a calendar.</dd>
        *    </dl>
        *
        * @default "standard"
        * @type String
        */
        this.setAttributeConfig("selectionMode", {
            value: "standard",
            validator: lang.isString
        });

        /**
        * @attribute sortedBy
        * @description Object literal provides metadata for initial sort values if
        * data will arrive pre-sorted:
        * <dl>
        *     <dt>sortedBy.key</dt>
        *     <dd>{String} Key of sorted Column</dd>
        *     <dt>sortedBy.dir</dt>
        *     <dd>{String} Initial sort direction, either YAHOO.widget.DataTable.CLASS_ASC or YAHOO.widget.DataTable.CLASS_DESC</dd>
        * </dl>
        * @type Object | null
        */
        this.setAttributeConfig("sortedBy", {
            value: null,
            // TODO: accepted array for nested sorts
            validator: function(oNewSortedBy) {
                if(oNewSortedBy) {
                    return (lang.isObject(oNewSortedBy) && oNewSortedBy.key);
                }
                else {
                    return (oNewSortedBy === null);
                }
            },
            method: function(oNewSortedBy) {
                // Stash the previous value
                var oOldSortedBy = this.get("sortedBy");

                // Workaround for bug 1827195
                this._configs.sortedBy.value = oNewSortedBy;

                // Remove ASC/DESC from TH
                var oOldColumn,
                    nOldColumnKeyIndex,
                    oNewColumn,
                    nNewColumnKeyIndex;

                if(this._elThead) {
                    if(oOldSortedBy && oOldSortedBy.key && oOldSortedBy.dir) {
                        oOldColumn = this._oColumnSet.getColumn(oOldSortedBy.key);
                        nOldColumnKeyIndex = oOldColumn.getKeyIndex();

                        // Remove previous UI from THEAD
                        var elOldTh = oOldColumn.getThEl();
                        Dom.removeClass(elOldTh, oOldSortedBy.dir);
                        this.formatTheadCell(oOldColumn.getThLinerEl().firstChild, oOldColumn, oNewSortedBy);
                    }
                    if(oNewSortedBy) {
                        oNewColumn = (oNewSortedBy.column) ? oNewSortedBy.column : this._oColumnSet.getColumn(oNewSortedBy.key);
                        nNewColumnKeyIndex = oNewColumn.getKeyIndex();

                        // Update THEAD with new UI
                        var elNewTh = oNewColumn.getThEl();
                        // Backward compatibility
                        if(oNewSortedBy.dir && ((oNewSortedBy.dir == "asc") ||  (oNewSortedBy.dir == "desc"))) {
                            var newClass = (oNewSortedBy.dir == "desc") ?
                                    DT.CLASS_DESC :
                                    DT.CLASS_ASC;
                            Dom.addClass(elNewTh, newClass);
                        }
                        else {
                             var sortClass = oNewSortedBy.dir || DT.CLASS_ASC;
                             Dom.addClass(elNewTh, sortClass);
                        }
                        this.formatTheadCell(oNewColumn.getThLinerEl().firstChild, oNewColumn, oNewSortedBy);
                    }
                }

                if(this._elTbody) {
                    // Update TBODY UI
                    this._elTbody.style.display = "none";
                    var allRows = this._elTbody.rows,
                        allCells;
                    for(var i=allRows.length-1; i>-1; i--) {
                        allCells = allRows[i].childNodes;
                        if(allCells[nOldColumnKeyIndex]) {
                            Dom.removeClass(allCells[nOldColumnKeyIndex], oOldSortedBy.dir);
                        }
                        if(allCells[nNewColumnKeyIndex]) {
                            Dom.addClass(allCells[nNewColumnKeyIndex], oNewSortedBy.dir);
                        }
                    }
                    this._elTbody.style.display = "";
                }

                this._clearTrTemplateEl();
            }
        });

        /**
        * @attribute paginator
        * @description An instance of YAHOO.widget.Paginator.
        * @default null
        * @type {Object|YAHOO.widget.Paginator}
        */
        this.setAttributeConfig("paginator", {
            value : null,
            validator : function (val) {
                return val === null || val instanceof widget.Paginator;
            },
            method : function () { this._updatePaginator.apply(this,arguments); }
        });

        /**
        * @attribute caption
        * @description Value for the CAPTION element. String values are treated as
        * markup and inserted into the DOM with innerHTML. NB: Not supported in
        * ScrollingDataTable.
        * @type HTML
        */
        this.setAttributeConfig("caption", {
            value: null,
            validator: lang.isString,
            method: function(sCaption) {
                this._initCaptionEl(sCaption);
            }
        });

        /**
        * @attribute draggableColumns
        * @description True if Columns are draggable to reorder, false otherwise.
        * The Drag & Drop Utility is required to enable this feature. Only top-level
        * and non-nested Columns are draggable. Write once.
        * @default false
        * @type Boolean
        */
        this.setAttributeConfig("draggableColumns", {
            value: false,
            validator: lang.isBoolean,
            method: function(oParam) {
                if(this._elThead) {
                    if(oParam) {
                        this._initDraggableColumns();
                    }
                    else {
                        this._destroyDraggableColumns();
                    }
                }
            }
        });

        /**
        * @attribute renderLoopSize
        * @description A value greater than 0 enables DOM rendering of rows to be
        * executed from a non-blocking timeout queue and sets how many rows to be
        * rendered per timeout. Recommended for very large data sets.
        * @type Number
        * @default 0
        */
         this.setAttributeConfig("renderLoopSize", {
             value: 0,
             validator: lang.isNumber
         });

        /**
        * @attribute sortFunction
        * @description Default Column sort function, receives the following args:
        *    <dl>
        *      <dt>a {Object}</dt>
        *      <dd>First sort argument.</dd>
        *      <dt>b {Object}</dt>
        *      <dd>Second sort argument.</dd>

        *      <dt>desc {Boolean}</dt>
        *      <dd>True if sort direction is descending, false if
        * sort direction is ascending.</dd>
        *      <dt>field {String}</dt>
        *      <dd>The field to sort by, from sortOptions.field</dd>
        *   </dl>
        * @type function
        */
        this.setAttributeConfig("sortFunction", {
            value: function(a, b, desc, field) {
                var compare = YAHOO.util.Sort.compare,
                    sorted = compare(a.getData(field),b.getData(field), desc);
                if(sorted === 0) {
                    return compare(a.getCount(),b.getCount(), desc); // Bug 1932978
                }
                else {
                    return sorted;
                }
            }
        });

        /**
        * @attribute formatRow
        * @description A function that accepts a TR element and its associated Record
        * for custom formatting. The function must return TRUE in order to automatically
        * continue formatting of child TD elements, else TD elements will not be
        * automatically formatted.
        * @type function
        * @default null
        */
        this.setAttributeConfig("formatRow", {
            value: null,
            validator: lang.isFunction
        });

        /**
        * @attribute generateRequest
        * @description A function that converts an object literal of desired DataTable
        * states into a request value which is then passed to the DataSource's
        * sendRequest method in order to retrieve data for those states. This
        * function is passed an object literal of state data and a reference to the
        * DataTable instance:
        *
        * <dl>
        *   <dt>pagination<dt>
        *   <dd>
        *         <dt>offsetRecord</dt>
        *         <dd>{Number} Index of the first Record of the desired page</dd>
        *         <dt>rowsPerPage</dt>
        *         <dd>{Number} Number of rows per page</dd>
        *   </dd>
        *   <dt>sortedBy</dt>
        *   <dd>
        *         <dt>key</dt>
        *         <dd>{String} Key of sorted Column</dd>
        *         <dt>dir</dt>
        *         <dd>{String} Sort direction, either YAHOO.widget.DataTable.CLASS_ASC or YAHOO.widget.DataTable.CLASS_DESC</dd>
        *   </dd>
        *   <dt>self</dt>
        *   <dd>The DataTable instance</dd>
        * </dl>
        *
        * and by default returns a String of syntax:
        * "sort={sortColumn}&dir={sortDir}&startIndex={pageStartIndex}&results={rowsPerPage}"
        * @type function
        * @default HTMLFunction
        */
        this.setAttributeConfig("generateRequest", {
            value: function(oState, oSelf) {
                // Set defaults
                oState = oState || {pagination:null, sortedBy:null};
                var sort = encodeURIComponent((oState.sortedBy) ? oState.sortedBy.key : oSelf.getColumnSet().keys[0].getKey());
                var dir = (oState.sortedBy && oState.sortedBy.dir === YAHOO.widget.DataTable.CLASS_DESC) ? "desc" : "asc";
                var startIndex = (oState.pagination) ? oState.pagination.recordOffset : 0;
                var results = (oState.pagination) ? oState.pagination.rowsPerPage : null;

                // Build the request
                return  "sort=" + sort +
                        "&dir=" + dir +
                        "&startIndex=" + startIndex +
                        ((results !== null) ? "&results=" + results : "");
            },
            validator: lang.isFunction
        });

        /**
        * @attribute initialRequest
        * @description Defines the initial request that gets sent to the DataSource
        * during initialization. Value is ignored if initialLoad is set to any value
        * other than true.
        * @type MIXED
        * @default null
        */
        this.setAttributeConfig("initialRequest", {
            value: null
        });

        /**
        * @attribute initialLoad
        * @description Determines whether or not to load data at instantiation. By
        * default, will trigger a sendRequest() to the DataSource and pass in the
        * request defined by initialRequest. If set to false, data will not load
        * at instantiation. Alternatively, implementers who wish to work with a
        * custom payload may pass in an object literal with the following values:
        *
        *    <dl>
        *      <dt>request (MIXED)</dt>
        *      <dd>Request value.</dd>
        *
        *      <dt>argument (MIXED)</dt>
        *      <dd>Custom data that will be passed through to the callback function.</dd>
        *    </dl>
        *
        *
        * @type Boolean | Object
        * @default true
        */
        this.setAttributeConfig("initialLoad", {
            value: true
        });

        /**
        * @attribute dynamicData
        * @description If true, sorting and pagination are relegated to the DataSource
        * for handling, using the request returned by the "generateRequest" function.
        * Each new DataSource response blows away all previous Records. False by default, so
        * sorting and pagination will be handled directly on the client side, without
        * causing any new requests for data from the DataSource.
        * @type Boolean
        * @default false
        */
        this.setAttributeConfig("dynamicData", {
            value: false,
            validator: lang.isBoolean
        });

        /**
         * @attribute MSG_EMPTY
         * @description Message to display if DataTable has no data. String
         * values are treated as markup and inserted into the DOM with innerHTML.
         * @type HTML
         * @default "No records found."
         */
         this.setAttributeConfig("MSG_EMPTY", {
             value: "No records found.",
             validator: lang.isString
         });

        /**
         * @attribute MSG_LOADING
         * @description Message to display while DataTable is loading data. String
         * values are treated as markup and inserted into the DOM with innerHTML.
         * @type HTML
         * @default "Loading..."
         */
         this.setAttributeConfig("MSG_LOADING", {
             value: "Loading...",
             validator: lang.isString
         });

        /**
         * @attribute MSG_ERROR
         * @description Message to display while DataTable has data error. String
         * values are treated as markup and inserted into the DOM with innerHTML.
         * @type HTML
         * @default "Data error."
         */
         this.setAttributeConfig("MSG_ERROR", {
             value: "Data error.",
             validator: lang.isString
         });

        /**
         * @attribute MSG_SORTASC
         * @description Message to display in tooltip to sort Column in ascending
         * order. String values are treated as markup and inserted into the DOM as
         * innerHTML.
         * @type HTML
         * @default "Click to sort ascending"
         */
         this.setAttributeConfig("MSG_SORTASC", {
             value: "Click to sort ascending",
             validator: lang.isString,
             method: function(sParam) {
                if(this._elThead) {
                    for(var i=0, allKeys=this.getColumnSet().keys, len=allKeys.length; i<len; i++) {
                        if(allKeys[i].sortable && this.getColumnSortDir(allKeys[i]) === DT.CLASS_ASC) {
                            allKeys[i]._elThLabel.firstChild.title = sParam;
                        }
                    }
                }
             }
         });

        /**
         * @attribute MSG_SORTDESC
         * @description Message to display in tooltip to sort Column in descending
         * order. String values are treated as markup and inserted into the DOM as
         * innerHTML.
         * @type HTML
         * @default "Click to sort descending"
         */
         this.setAttributeConfig("MSG_SORTDESC", {
             value: "Click to sort descending",
             validator: lang.isString,
             method: function(sParam) {
                if(this._elThead) {
                    for(var i=0, allKeys=this.getColumnSet().keys, len=allKeys.length; i<len; i++) {
                        if(allKeys[i].sortable && this.getColumnSortDir(allKeys[i]) === DT.CLASS_DESC) {
                            allKeys[i]._elThLabel.firstChild.title = sParam;
                        }
                    }
                }
             }
         });

        /**
         * @attribute currencySymbol
         * @deprecated Use currencyOptions.
         */
        this.setAttributeConfig("currencySymbol", {
            value: "$",
            validator: lang.isString
        });

        /**
         * Default config passed to YAHOO.util.Number.format() by the 'currency' Column formatter.
         * @attribute currencyOptions
         * @type Object
         * @default {prefix: $, decimalPlaces:2, decimalSeparator:".", thousandsSeparator:","}
         */
        this.setAttributeConfig("currencyOptions", {
            value: {
                prefix: this.get("currencySymbol"), // TODO: deprecate currencySymbol
                decimalPlaces:2,
                decimalSeparator:".",
                thousandsSeparator:","
            }
        });

        /**
         * Default config passed to YAHOO.util.Date.format() by the 'date' Column formatter.
         * @attribute dateOptions
         * @type Object
         * @default {format:"%m/%d/%Y", locale:"en"}
         */
        this.setAttributeConfig("dateOptions", {
            value: {format:"%m/%d/%Y", locale:"en"}
        });

        /**
         * Default config passed to YAHOO.util.Number.format() by the 'number' Column formatter.
         * @attribute numberOptions
         * @type Object
         * @default {decimalPlaces:0, thousandsSeparator:","}
         */
        this.setAttributeConfig("numberOptions", {
            value: {
                decimalPlaces:0,
                thousandsSeparator:","
            }
        });

    },

    /////////////////////////////////////////////////////////////////////////////
    //
    // Private member variables
    //
    /////////////////////////////////////////////////////////////////////////////

    /**
     * True if instance is initialized, so as to fire the initEvent after render.
     *
     * @property _bInit
     * @type Boolean
     * @default true
     * @private
     */
    _bInit : true,

    /**
     * Index assigned to instance.
     *
     * @property _nIndex
     * @type Number
     * @private
     */
    _nIndex : null,

    /**
     * Counter for IDs assigned to TR elements.
     *
     * @property _nTrCount
     * @type Number
     * @private
     */
    _nTrCount : 0,

    /**
     * Counter for IDs assigned to TD elements.
     *
     * @property _nTdCount
     * @type Number
     * @private
     */
    _nTdCount : 0,

    /**
     * Unique id assigned to instance "yui-dtN", useful prefix for generating unique
     * DOM ID strings and log messages.
     *
     * @property _sId
     * @type String
     * @private
     */
    _sId : null,

    /**
     * Render chain.
     *
     * @property _oChainRender
     * @type YAHOO.util.Chain
     * @private
     */
    _oChainRender : null,

    /**
     * DOM reference to the container element for the DataTable instance into which
     * all other elements get created.
     *
     * @property _elContainer
     * @type HTMLElement
     * @private
     */
    _elContainer : null,

    /**
     * DOM reference to the mask element for the DataTable instance which disables it.
     *
     * @property _elMask
     * @type HTMLElement
     * @private
     */
    _elMask : null,

    /**
     * DOM reference to the TABLE element for the DataTable instance.
     *
     * @property _elTable
     * @type HTMLElement
     * @private
     */
    _elTable : null,

    /**
     * DOM reference to the CAPTION element for the DataTable instance.
     *
     * @property _elCaption
     * @type HTMLElement
     * @private
     */
    _elCaption : null,

    /**
     * DOM reference to the COLGROUP element for the DataTable instance.
     *
     * @property _elColgroup
     * @type HTMLElement
     * @private
     */
    _elColgroup : null,

    /**
     * DOM reference to the THEAD element for the DataTable instance.
     *
     * @property _elThead
     * @type HTMLElement
     * @private
     */
    _elThead : null,

    /**
     * DOM reference to the primary TBODY element for the DataTable instance.
     *
     * @property _elTbody
     * @type HTMLElement
     * @private
     */
    _elTbody : null,

    /**
     * DOM reference to the secondary TBODY element used to display DataTable messages.
     *
     * @property _elMsgTbody
     * @type HTMLElement
     * @private
     */
    _elMsgTbody : null,

    /**
     * DOM reference to the secondary TBODY element's single TR element used to display DataTable messages.
     *
     * @property _elMsgTr
     * @type HTMLElement
     * @private
     */
    _elMsgTr : null,

    /**
     * DOM reference to the secondary TBODY element's single TD element used to display DataTable messages.
     *
     * @property _elMsgTd
     * @type HTMLElement
     * @private
     */
    _elMsgTd : null,

    /**
     * Element reference to shared Column drag target.
     *
     * @property _elColumnDragTarget
     * @type HTMLElement
     * @private
     */
    _elColumnDragTarget : null,

    /**
     * Element reference to shared Column resizer proxy.
     *
     * @property _elColumnResizerProxy
     * @type HTMLElement
     * @private
     */
    _elColumnResizerProxy : null,

    /**
     * DataSource instance for the DataTable instance.
     *
     * @property _oDataSource
     * @type YAHOO.util.DataSource
     * @private
     */
    _oDataSource : null,

    /**
     * ColumnSet instance for the DataTable instance.
     *
     * @property _oColumnSet
     * @type YAHOO.widget.ColumnSet
     * @private
     */
    _oColumnSet : null,

    /**
     * RecordSet instance for the DataTable instance.
     *
     * @property _oRecordSet
     * @type YAHOO.widget.RecordSet
     * @private
     */
    _oRecordSet : null,

    /**
     * The active CellEditor instance for the DataTable instance.
     *
     * @property _oCellEditor
     * @type YAHOO.widget.CellEditor
     * @private
     */
    _oCellEditor : null,

    /**
     * ID string of first TR element of the current DataTable page.
     *
     * @property _sFirstTrId
     * @type String
     * @private
     */
    _sFirstTrId : null,

    /**
     * ID string of the last TR element of the current DataTable page.
     *
     * @property _sLastTrId
     * @type String
     * @private
     */
    _sLastTrId : null,

    /**
     * Template row to create all new rows from.
     * @property _elTrTemplate
     * @type {HTMLElement}
     * @private
     */
    _elTrTemplate : null,

    /**
     * Sparse array of custom functions to set column widths for browsers that don't
     * support dynamic CSS rules.  Functions are added at the index representing
     * the number of rows they update.
     *
     * @property _aDynFunctions
     * @type Array
     * @private
     */
    _aDynFunctions : [],

    /**
     * Disabled state.
     *
     * @property _disabled
     * @type Boolean
     * @private
     */
    _disabled : false,

    /////////////////////////////////////////////////////////////////////////////
    //
    // Private methods
    //
    /////////////////////////////////////////////////////////////////////////////

    /**
     * Clears browser text selection. Useful to call on rowSelectEvent or
     * cellSelectEvent to prevent clicks or dblclicks from selecting text in the
     * browser.
     *
     * @method clearTextSelection
     */
    clearTextSelection : function() {
        var sel;
        if(window.getSelection) {
            sel = window.getSelection();
        }
        else if(document.getSelection) {
            sel = document.getSelection();
        }
        else if(document.selection) {
            sel = document.selection;
        }
        if(sel) {
            if(sel.empty) {
                sel.empty();
            }
            else if (sel.removeAllRanges) {
                sel.removeAllRanges();
            }
            else if(sel.collapse) {
                sel.collapse();
            }
        }
    },

    /**
     * Sets focus on the given element.
     *
     * @method _focusEl
     * @param el {HTMLElement} Element.
     * @private
     */
    _focusEl : function(el) {
        el = el || this._elTbody;
        // http://developer.mozilla.org/en/docs/index.php?title=Key-navigable_custom_DHTML_widgets
        // The timeout is necessary in both IE and Firefox 1.5, to prevent scripts from doing
        // strange unexpected things as the user clicks on buttons and other controls.
        setTimeout(function() {
            try {
                el.focus();
            }
            catch(e) {
            }
        },0);
    },

    /**
     * Forces Gecko repaint.
     *
     * @method _repaintGecko
     * @el {HTMLElement} (Optional) Element to repaint, otherwise entire document body.
     * @private
     */
    _repaintGecko : (ua.gecko) ?
        function(el) {
            el = el || this._elContainer;
            var parent = el.parentNode;
            var nextSibling = el.nextSibling;
            parent.insertBefore(parent.removeChild(el), nextSibling);
        } : function() {},

    /**
     * Forces Opera repaint.
     *
     * @method _repaintOpera
     * @private
     */
    _repaintOpera : (ua.opera) ?
        function() {
            if(ua.opera) {
                document.documentElement.className += " ";
                document.documentElement.className = YAHOO.lang.trim(document.documentElement.className);
            }
        } : function() {} ,

    /**
     * Forces Webkit repaint.
     *
     * @method _repaintWebkit
     * @el {HTMLElement} (Optional) Element to repaint, otherwise entire document body.
     * @private
     */
    _repaintWebkit : (ua.webkit) ?
        function(el) {
            el = el || this._elContainer;
            var parent = el.parentNode;
            var nextSibling = el.nextSibling;
            parent.insertBefore(parent.removeChild(el), nextSibling);
        } : function() {},

    // INIT FUNCTIONS

    /**
     * Initializes object literal of config values.
     *
     * @method _initConfigs
     * @param oConfig {Object} Object literal of config values.
     * @private
     */
    _initConfigs : function(oConfigs) {
        if(!oConfigs || !lang.isObject(oConfigs)) {
            oConfigs = {};
        }
        this.configs = oConfigs;
    },

    /**
     * Initializes ColumnSet.
     *
     * @method _initColumnSet
     * @param aColumnDefs {Object[]} Array of object literal Column definitions.
     * @private
     */
    _initColumnSet : function(aColumnDefs) {
        var oColumn, i, len;

        if(this._oColumnSet) {
            // First clear _oDynStyles for existing ColumnSet and
            // uregister CellEditor Custom Events
            for(i=0, len=this._oColumnSet.keys.length; i<len; i++) {
                oColumn = this._oColumnSet.keys[i];
                DT._oDynStyles["."+this.getId()+"-col-"+oColumn.getSanitizedKey()+" ."+DT.CLASS_LINER] = undefined;
                if(oColumn.editor && oColumn.editor.unsubscribeAll) { // Backward compatibility
                    oColumn.editor.unsubscribeAll();
                }
            }

            this._oColumnSet = null;
            this._clearTrTemplateEl();
        }

        if(lang.isArray(aColumnDefs)) {
            this._oColumnSet =  new YAHOO.widget.ColumnSet(aColumnDefs);
        }
        // Backward compatibility
        else if(aColumnDefs instanceof YAHOO.widget.ColumnSet) {
            this._oColumnSet =  aColumnDefs;
            YAHOO.log("DataTable's constructor now requires an array" +
            " of object literal Column definitions instead of a ColumnSet instance",
            "warn", this.toString());
        }

        // Register CellEditor Custom Events
        var allKeys = this._oColumnSet.keys;
        for(i=0, len=allKeys.length; i<len; i++) {
            oColumn = allKeys[i];
            if(oColumn.editor && oColumn.editor.subscribe) { // Backward incompatibility
                oColumn.editor.subscribe("showEvent", this._onEditorShowEvent, this, true);
                oColumn.editor.subscribe("keydownEvent", this._onEditorKeydownEvent, this, true);
                oColumn.editor.subscribe("revertEvent", this._onEditorRevertEvent, this, true);
                oColumn.editor.subscribe("saveEvent", this._onEditorSaveEvent, this, true);
                oColumn.editor.subscribe("cancelEvent", this._onEditorCancelEvent, this, true);
                oColumn.editor.subscribe("blurEvent", this._onEditorBlurEvent, this, true);
                oColumn.editor.subscribe("blockEvent", this._onEditorBlockEvent, this, true);
                oColumn.editor.subscribe("unblockEvent", this._onEditorUnblockEvent, this, true);
            }
        }
    },

    /**
     * Initializes DataSource.
     *
     * @method _initDataSource
     * @param oDataSource {YAHOO.util.DataSource} DataSource instance.
     * @private
     */
    _initDataSource : function(oDataSource) {
        this._oDataSource = null;
        if(oDataSource && (lang.isFunction(oDataSource.sendRequest))) {
            this._oDataSource = oDataSource;
        }
        // Backward compatibility
        else {
            var tmpTable = null;
            var tmpContainer = this._elContainer;
            var i=0;
            //TODO: this will break if re-initing DS at runtime for SDT
            // Peek in container child nodes to see if TABLE already exists
            if(tmpContainer.hasChildNodes()) {
                var tmpChildren = tmpContainer.childNodes;
                for(i=0; i<tmpChildren.length; i++) {
                    if(tmpChildren[i].nodeName && tmpChildren[i].nodeName.toLowerCase() == "table") {
                        tmpTable = tmpChildren[i];
                        break;
                    }
                }
                if(tmpTable) {
                    var tmpFieldsArray = [];
                    for(; i<this._oColumnSet.keys.length; i++) {
                        tmpFieldsArray.push({key:this._oColumnSet.keys[i].key});
                    }

                    this._oDataSource = new DS(tmpTable);
                    this._oDataSource.responseType = DS.TYPE_HTMLTABLE;
                    this._oDataSource.responseSchema = {fields: tmpFieldsArray};
                    YAHOO.log("Null DataSource for progressive enhancement from" +
                    " markup has been deprecated", "warn", this.toString());
                }
            }
        }
    },

    /**
     * Initializes RecordSet.
     *
     * @method _initRecordSet
     * @private
     */
    _initRecordSet : function() {
        if(this._oRecordSet) {
            this._oRecordSet.reset();
        }
        else {
            this._oRecordSet = new YAHOO.widget.RecordSet();
        }
    },

    /**
     * Initializes DOM elements.
     *
     * @method _initDomElements
     * @param elContainer {HTMLElement | String} HTML DIV element by reference or ID.
     * return {Boolean} False in case of error, otherwise true
     * @private
     */
    _initDomElements : function(elContainer) {
        // Outer container
        this._initContainerEl(elContainer);
        // TABLE
        this._initTableEl(this._elContainer);
        // COLGROUP
        this._initColgroupEl(this._elTable);
        // THEAD
        this._initTheadEl(this._elTable);

        // Message TBODY
        this._initMsgTbodyEl(this._elTable);

        // Primary TBODY
        this._initTbodyEl(this._elTable);

        if(!this._elContainer || !this._elTable || !this._elColgroup ||  !this._elThead || !this._elTbody || !this._elMsgTbody) {
            return false;
        }
        else {
            return true;
        }
    },

    /**
     * Destroy's the DataTable outer container element, if available.
     *
     * @method _destroyContainerEl
     * @param elContainer {HTMLElement} Reference to the container element.
     * @private
     */
    _destroyContainerEl : function(elContainer) {
            var columns = this._oColumnSet.keys,
            elements, i;

            Dom.removeClass(elContainer, DT.CLASS_DATATABLE);

        // Bug 2528783
        Ev.purgeElement( elContainer );
        Ev.purgeElement( this._elThead, true ); // recursive to get resize handles
        Ev.purgeElement( this._elTbody );
        Ev.purgeElement( this._elMsgTbody );

        // because change doesn't bubble, each select (via formatDropdown) gets
        // its own subscription
        elements = elContainer.getElementsByTagName( 'select' );

        if ( elements.length ) {
            Ev.detachListener( elements, 'change' );
        }

        for ( i = columns.length - 1; i >= 0; --i ) {
            if ( columns[i].editor ) {
                Ev.purgeElement( columns[i].editor._elContainer );
            }
        }

        elContainer.innerHTML = "";

        this._elContainer = null;
        this._elColgroup = null;
        this._elThead = null;
        this._elTbody = null;
    },

    /**
     * Initializes the DataTable outer container element, including a mask.
     *
     * @method _initContainerEl
     * @param elContainer {HTMLElement | String} HTML DIV element by reference or ID.
     * @private
     */
    _initContainerEl : function(elContainer) {
        // Validate container
        elContainer = Dom.get(elContainer);

        if(elContainer && elContainer.nodeName && (elContainer.nodeName.toLowerCase() == "div")) {
            // Destroy previous
            this._destroyContainerEl(elContainer);

            Dom.addClass(elContainer, DT.CLASS_DATATABLE);
            Ev.addListener(elContainer, "focus", this._onTableFocus, this);
            Ev.addListener(elContainer, "dblclick", this._onTableDblclick, this);
            this._elContainer = elContainer;

            var elMask = document.createElement("div");
            elMask.className = DT.CLASS_MASK;
            elMask.style.display = "none";
            this._elMask = elContainer.appendChild(elMask);
        }
    },

    /**
     * Destroy's the DataTable TABLE element, if available.
     *
     * @method _destroyTableEl
     * @private
     */
    _destroyTableEl : function() {
        var elTable = this._elTable;
        if(elTable) {
            Ev.purgeElement(elTable, true);
            elTable.parentNode.removeChild(elTable);
            this._elCaption = null;
            this._elColgroup = null;
            this._elThead = null;
            this._elTbody = null;
        }
    },

    /**
     * Creates HTML markup CAPTION element.
     *
     * @method _initCaptionEl
     * @param sCaption {HTML} Caption value. String values are treated as markup and
     * inserted into the DOM with innerHTML.
     * @private
     */
    _initCaptionEl : function(sCaption) {
        if(this._elTable && sCaption) {
            // Create CAPTION element
            if(!this._elCaption) {
                this._elCaption = this._elTable.createCaption();
            }
            // Set CAPTION value
            this._elCaption.innerHTML = sCaption;
        }
        else if(this._elCaption) {
            this._elCaption.parentNode.removeChild(this._elCaption);
        }
    },

    /**
     * Creates HTML markup for TABLE, COLGROUP, THEAD and TBODY elements in outer
     * container element.
     *
     * @method _initTableEl
     * @param elContainer {HTMLElement} Container element into which to create TABLE.
     * @private
     */
    _initTableEl : function(elContainer) {
        if(elContainer) {
            // Destroy previous
            this._destroyTableEl();

            // Create TABLE
            this._elTable = elContainer.appendChild(document.createElement("table"));

            // Set SUMMARY attribute
            this._elTable.summary = this.get("summary");

            // Create CAPTION element
            if(this.get("caption")) {
                this._initCaptionEl(this.get("caption"));
            }

            // Set up mouseover/mouseout events via mouseenter/mouseleave delegation
            Ev.delegate(this._elTable, "mouseenter", this._onTableMouseover, "thead ."+DT.CLASS_LABEL, this);
            Ev.delegate(this._elTable, "mouseleave", this._onTableMouseout, "thead ."+DT.CLASS_LABEL, this);
            Ev.delegate(this._elTable, "mouseenter", this._onTableMouseover, "tbody.yui-dt-data>tr>td", this);
            Ev.delegate(this._elTable, "mouseleave", this._onTableMouseout, "tbody.yui-dt-data>tr>td", this);
            Ev.delegate(this._elTable, "mouseenter", this._onTableMouseover, "tbody.yui-dt-message>tr>td", this);
            Ev.delegate(this._elTable, "mouseleave", this._onTableMouseout, "tbody.yui-dt-message>tr>td", this);
        }
    },

    /**
     * Destroy's the DataTable COLGROUP element, if available.
     *
     * @method _destroyColgroupEl
     * @private
     */
    _destroyColgroupEl : function() {
        var elColgroup = this._elColgroup;
        if(elColgroup) {
            var elTable = elColgroup.parentNode;
            Ev.purgeElement(elColgroup, true);
            elTable.removeChild(elColgroup);
            this._elColgroup = null;
        }
    },

    /**
     * Initializes COLGROUP and COL elements for managing minWidth.
     *
     * @method _initColgroupEl
     * @param elTable {HTMLElement} TABLE element into which to create COLGROUP.
     * @private
     */
    _initColgroupEl : function(elTable) {
        if(elTable) {
            // Destroy previous
            this._destroyColgroupEl();

            // Add COLs to DOCUMENT FRAGMENT
            var allCols = this._aColIds || [],
                allKeys = this._oColumnSet.keys,
                i = 0, len = allCols.length,
                elCol, oColumn,
                elFragment = document.createDocumentFragment(),
                elColTemplate = document.createElement("col");

            for(i=0,len=allKeys.length; i<len; i++) {
                oColumn = allKeys[i];
                elCol = elFragment.appendChild(elColTemplate.cloneNode(false));
            }

            // Create COLGROUP
            var elColgroup = elTable.insertBefore(document.createElement("colgroup"), elTable.firstChild);
            elColgroup.appendChild(elFragment);
            this._elColgroup = elColgroup;
        }
    },

    /**
     * Adds a COL element to COLGROUP at given index.
     *
     * @method _insertColgroupColEl
     * @param index {Number} Index of new COL element.
     * @private
     */
    _insertColgroupColEl : function(index) {
        if(lang.isNumber(index)&& this._elColgroup) {
            var nextSibling = this._elColgroup.childNodes[index] || null;
            this._elColgroup.insertBefore(document.createElement("col"), nextSibling);
        }
    },

    /**
     * Removes a COL element to COLGROUP at given index.
     *
     * @method _removeColgroupColEl
     * @param index {Number} Index of removed COL element.
     * @private
     */
    _removeColgroupColEl : function(index) {
        if(lang.isNumber(index) && this._elColgroup && this._elColgroup.childNodes[index]) {
            this._elColgroup.removeChild(this._elColgroup.childNodes[index]);
        }
    },

    /**
     * Reorders a COL element from old index(es) to new index.
     *
     * @method _reorderColgroupColEl
     * @param aKeyIndexes {Number[]} Array of indexes of removed COL element.
     * @param newIndex {Number} New index.
     * @private
     */
    _reorderColgroupColEl : function(aKeyIndexes, newIndex) {
        if(lang.isArray(aKeyIndexes) && lang.isNumber(newIndex) && this._elColgroup && (this._elColgroup.childNodes.length > aKeyIndexes[aKeyIndexes.length-1])) {
            var i,
                tmpCols = [];
            // Remove COL
            for(i=aKeyIndexes.length-1; i>-1; i--) {
                tmpCols.push(this._elColgroup.removeChild(this._elColgroup.childNodes[aKeyIndexes[i]]));
            }
            // Insert COL
            var nextSibling = this._elColgroup.childNodes[newIndex] || null;
            for(i=tmpCols.length-1; i>-1; i--) {
                this._elColgroup.insertBefore(tmpCols[i], nextSibling);
            }
        }
    },

    /**
     * Destroy's the DataTable THEAD element, if available.
     *
     * @method _destroyTheadEl
     * @private
     */
    _destroyTheadEl : function() {
        var elThead = this._elThead;
        if(elThead) {
            var elTable = elThead.parentNode;
            Ev.purgeElement(elThead, true);
            this._destroyColumnHelpers();
            elTable.removeChild(elThead);
            this._elThead = null;
        }
    },

    /**
     * Initializes THEAD element.
     *
     * @method _initTheadEl
     * @param elTable {HTMLElement} TABLE element into which to create COLGROUP.
     * @param {HTMLElement} Initialized THEAD element.
     * @private
     */
    _initTheadEl : function(elTable) {
        elTable = elTable || this._elTable;

        if(elTable) {
            // Destroy previous
            this._destroyTheadEl();

            //TODO: append to DOM later for performance
            var elThead = (this._elColgroup) ?
                elTable.insertBefore(document.createElement("thead"), this._elColgroup.nextSibling) :
                elTable.appendChild(document.createElement("thead"));

            // Set up DOM events for THEAD
            Ev.addListener(elThead, "focus", this._onTheadFocus, this);
            Ev.addListener(elThead, "keydown", this._onTheadKeydown, this);
            Ev.addListener(elThead, "mousedown", this._onTableMousedown, this);
            Ev.addListener(elThead, "mouseup", this._onTableMouseup, this);
            Ev.addListener(elThead, "click", this._onTheadClick, this);

            // Bug 2528073: mouseover/mouseout handled via mouseenter/mouseleave
            // delegation at the TABLE level

            // Since we can't listen for click and dblclick on the same element...
            // Attach separately to THEAD and TBODY
            ///Ev.addListener(elThead, "dblclick", this._onTableDblclick, this);

           var oColumnSet = this._oColumnSet,
                oColumn, i,j, l;

            // Add TRs to the THEAD
            var colTree = oColumnSet.tree;
            var elTh;
            for(i=0; i<colTree.length; i++) {
                var elTheadTr = elThead.appendChild(document.createElement("tr"));

                // ...and create TH cells
                for(j=0; j<colTree[i].length; j++) {
                    oColumn = colTree[i][j];
                    elTh = elTheadTr.appendChild(document.createElement("th"));
                    this._initThEl(elTh,oColumn);
                }

                    // Set FIRST/LAST on THEAD rows
                    if(i === 0) {
                        Dom.addClass(elTheadTr, DT.CLASS_FIRST);
                    }
                    if(i === (colTree.length-1)) {
                        Dom.addClass(elTheadTr, DT.CLASS_LAST);
                    }

            }

            // Set FIRST/LAST on edge TH elements using the values in ColumnSet headers array
            var aFirstHeaders = oColumnSet.headers[0] || [];
            for(i=0; i<aFirstHeaders.length; i++) {
                Dom.addClass(Dom.get(this.getId() +"-th-"+aFirstHeaders[i]), DT.CLASS_FIRST);
            }
            var aLastHeaders = oColumnSet.headers[oColumnSet.headers.length-1] || [];
            for(i=0; i<aLastHeaders.length; i++) {
                Dom.addClass(Dom.get(this.getId() +"-th-"+aLastHeaders[i]), DT.CLASS_LAST);
            }

            YAHOO.log("TH cells for " + this._oColumnSet.keys.length + " keys created","info",this.toString());

            ///TODO: try _repaintGecko(this._elContainer) instead
            // Bug 1806891
            if(ua.webkit && ua.webkit < 420) {
                var oSelf = this;
                setTimeout(function() {
                    elThead.style.display = "";
                },0);
                elThead.style.display = 'none';
            }

            this._elThead = elThead;

            // Column helpers needs _elThead to exist
            this._initColumnHelpers();
        }
    },

    /**
     * Populates TH element as defined by Column.
     *
     * @method _initThEl
     * @param elTh {HTMLElement} TH element reference.
     * @param oColumn {YAHOO.widget.Column} Column object.
     * @private
     */
    _initThEl : function(elTh, oColumn) {
        elTh.id = this.getId() + "-th-" + oColumn.getSanitizedKey(); // Needed for accessibility, getColumn by TH, and ColumnDD
        elTh.innerHTML = "";
        elTh.rowSpan = oColumn.getRowspan();
        elTh.colSpan = oColumn.getColspan();
        oColumn._elTh = elTh;

        var elThLiner = elTh.appendChild(document.createElement("div"));
        elThLiner.id = elTh.id + "-liner"; // Needed for resizer
        elThLiner.className = DT.CLASS_LINER;
        oColumn._elThLiner = elThLiner;

        var elThLabel = elThLiner.appendChild(document.createElement("span"));
        elThLabel.className = DT.CLASS_LABEL;

        // Assign abbr attribute
        if(oColumn.abbr) {
            elTh.abbr = oColumn.abbr;
        }
        // Clear minWidth on hidden Columns
        if(oColumn.hidden) {
            this._clearMinWidth(oColumn);
        }

        elTh.className = this._getColumnClassNames(oColumn);

        // Set Column width...
        if(oColumn.width) {
            // Validate minWidth
            var nWidth = (oColumn.minWidth && (oColumn.width < oColumn.minWidth)) ?
                    oColumn.minWidth : oColumn.width;
            // ...for fallback cases
            if(DT._bDynStylesFallback) {
                elTh.firstChild.style.overflow = 'hidden';
                elTh.firstChild.style.width = nWidth + 'px';
            }
            // ...for non fallback cases
            else {
                this._setColumnWidthDynStyles(oColumn, nWidth + 'px', 'hidden');
            }
        }

        this.formatTheadCell(elThLabel, oColumn, this.get("sortedBy"));
        oColumn._elThLabel = elThLabel;
    },

    /**
     * Outputs markup into the given TH based on given Column.
     *
     * @method formatTheadCell
     * @param elCellLabel {HTMLElement} The label SPAN element within the TH liner,
     * not the liner DIV element.
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param oSortedBy {Object} Sort state object literal.
    */
    formatTheadCell : function(elCellLabel, oColumn, oSortedBy) {
        var sKey = oColumn.getKey();
        var sLabel = lang.isValue(oColumn.label) ? oColumn.label : sKey;

        // Add accessibility link for sortable Columns
        if(oColumn.sortable) {
            // Calculate the direction
            var sSortClass = this.getColumnSortDir(oColumn, oSortedBy);
            var bDesc = (sSortClass === DT.CLASS_DESC);

            // This is the sorted Column
            if(oSortedBy && (oColumn.key === oSortedBy.key)) {
                bDesc = !(oSortedBy.dir === DT.CLASS_DESC);
            }

            // Generate a unique HREF for visited status
            var sHref = this.getId() + "-href-" + oColumn.getSanitizedKey();

            // Generate a dynamic TITLE for sort status
            var sTitle = (bDesc) ? this.get("MSG_SORTDESC") : this.get("MSG_SORTASC");

            // Format the element
            elCellLabel.innerHTML = "<a href=\"" + sHref + "\" title=\"" + sTitle + "\" class=\"" + DT.CLASS_SORTABLE + "\">" + sLabel + "</a>";
        }
        // Just display the label for non-sortable Columns
        else {
            elCellLabel.innerHTML = sLabel;
        }
    },

    /**
     * Disables DD from top-level Column TH elements.
     *
     * @method _destroyDraggableColumns
     * @private
     */
    _destroyDraggableColumns : function() {
        var oColumn, elTh;
        for(var i=0, len=this._oColumnSet.tree[0].length; i<len; i++) {
            oColumn = this._oColumnSet.tree[0][i];
            if(oColumn._dd) {
                oColumn._dd = oColumn._dd.unreg();
                Dom.removeClass(oColumn.getThEl(), DT.CLASS_DRAGGABLE);
            }
        }

        // Destroy column drag proxy
        this._destroyColumnDragTargetEl();
    },

    /**
     * Initializes top-level Column TH elements into DD instances.
     *
     * @method _initDraggableColumns
     * @private
     */
    _initDraggableColumns : function() {
        this._destroyDraggableColumns();
        if(util.DD) {
            var oColumn, elTh, elDragTarget;
            for(var i=0, len=this._oColumnSet.tree[0].length; i<len; i++) {
                oColumn = this._oColumnSet.tree[0][i];
                elTh = oColumn.getThEl();
                Dom.addClass(elTh, DT.CLASS_DRAGGABLE);
                elDragTarget = this._initColumnDragTargetEl();
                oColumn._dd = new YAHOO.widget.ColumnDD(this, oColumn, elTh, elDragTarget);
            }
        }
        else {
            YAHOO.log("Could not find DragDrop for draggable Columns", "warn", this.toString());
        }
    },

    /**
     * Destroys shared Column drag target.
     *
     * @method _destroyColumnDragTargetEl
     * @private
     */
    _destroyColumnDragTargetEl : function() {
        if(this._elColumnDragTarget) {
            var el = this._elColumnDragTarget;
            YAHOO.util.Event.purgeElement(el);
            el.parentNode.removeChild(el);
            this._elColumnDragTarget = null;
        }
    },

    /**
     * Creates HTML markup for shared Column drag target.
     *
     * @method _initColumnDragTargetEl
     * @return {HTMLElement} Reference to Column drag target.
     * @private
     */
    _initColumnDragTargetEl : function() {
        if(!this._elColumnDragTarget) {
            // Attach Column drag target element as first child of body
            var elColumnDragTarget = document.createElement('div');
            elColumnDragTarget.id = this.getId() + "-coltarget";
            elColumnDragTarget.className = DT.CLASS_COLTARGET;
            elColumnDragTarget.style.display = "none";
            document.body.insertBefore(elColumnDragTarget, document.body.firstChild);

            // Internal tracker of Column drag target
            this._elColumnDragTarget = elColumnDragTarget;

        }
        return this._elColumnDragTarget;
    },

    /**
     * Disables resizeability on key Column TH elements.
     *
     * @method _destroyResizeableColumns
     * @private
     */
    _destroyResizeableColumns : function() {
        var aKeys = this._oColumnSet.keys;
        for(var i=0, len=aKeys.length; i<len; i++) {
            if(aKeys[i]._ddResizer) {
                aKeys[i]._ddResizer = aKeys[i]._ddResizer.unreg();
                Dom.removeClass(aKeys[i].getThEl(), DT.CLASS_RESIZEABLE);
            }
        }

        // Destroy resizer proxy
        this._destroyColumnResizerProxyEl();
    },

    /**
     * Initializes resizeability on key Column TH elements.
     *
     * @method _initResizeableColumns
     * @private
     */
    _initResizeableColumns : function() {
        this._destroyResizeableColumns();
        if(util.DD) {
            var oColumn, elTh, elThLiner, elThResizerLiner, elThResizer, elResizerProxy, cancelClick;
            for(var i=0, len=this._oColumnSet.keys.length; i<len; i++) {
                oColumn = this._oColumnSet.keys[i];
                if(oColumn.resizeable) {
                    elTh = oColumn.getThEl();
                    Dom.addClass(elTh, DT.CLASS_RESIZEABLE);
                    elThLiner = oColumn.getThLinerEl();

                    // Bug 1915349: So resizer is as tall as TH when rowspan > 1
                    // Create a separate resizer liner with position:relative
                    elThResizerLiner = elTh.appendChild(document.createElement("div"));
                    elThResizerLiner.className = DT.CLASS_RESIZERLINER;

                    // Move TH contents into the new resizer liner
                    elThResizerLiner.appendChild(elThLiner);

                    // Create the resizer
                    elThResizer = elThResizerLiner.appendChild(document.createElement("div"));
                    elThResizer.id = elTh.id + "-resizer"; // Needed for ColumnResizer
                    elThResizer.className = DT.CLASS_RESIZER;
                    oColumn._elResizer = elThResizer;

                    // Create the resizer proxy, once per instance
                    elResizerProxy = this._initColumnResizerProxyEl();
                    oColumn._ddResizer = new YAHOO.util.ColumnResizer(
                            this, oColumn, elTh, elThResizer, elResizerProxy);
                    cancelClick = function(e) {
                        Ev.stopPropagation(e);
                    };
                    Ev.addListener(elThResizer,"click",cancelClick);
                }
            }
        }
        else {
            YAHOO.log("Could not find DragDrop for resizeable Columns", "warn", this.toString());
        }
    },

    /**
     * Destroys shared Column resizer proxy.
     *
     * @method _destroyColumnResizerProxyEl
     * @return {HTMLElement} Reference to Column resizer proxy.
     * @private
     */
    _destroyColumnResizerProxyEl : function() {
        if(this._elColumnResizerProxy) {
            var el = this._elColumnResizerProxy;
            YAHOO.util.Event.purgeElement(el);
            el.parentNode.removeChild(el);
            this._elColumnResizerProxy = null;
        }
    },

    /**
     * Creates HTML markup for shared Column resizer proxy.
     *
     * @method _initColumnResizerProxyEl
     * @return {HTMLElement} Reference to Column resizer proxy.
     * @private
     */
    _initColumnResizerProxyEl : function() {
        if(!this._elColumnResizerProxy) {
            // Attach Column resizer element as first child of body
            var elColumnResizerProxy = document.createElement("div");
            elColumnResizerProxy.id = this.getId() + "-colresizerproxy"; // Needed for ColumnResizer
            elColumnResizerProxy.className = DT.CLASS_RESIZERPROXY;
            document.body.insertBefore(elColumnResizerProxy, document.body.firstChild);

            // Internal tracker of Column resizer proxy
            this._elColumnResizerProxy = elColumnResizerProxy;
        }
        return this._elColumnResizerProxy;
    },

    /**
     * Destroys elements associated with Column functionality: ColumnDD and ColumnResizers.
     *
     * @method _destroyColumnHelpers
     * @private
     */
    _destroyColumnHelpers : function() {
        this._destroyDraggableColumns();
        this._destroyResizeableColumns();
    },

    /**
     * Initializes elements associated with Column functionality: ColumnDD and ColumnResizers.
     *
     * @method _initColumnHelpers
     * @private
     */
    _initColumnHelpers : function() {
        if(this.get("draggableColumns")) {
            this._initDraggableColumns();
        }
        this._initResizeableColumns();
    },

    /**
     * Destroy's the DataTable TBODY element, if available.
     *
     * @method _destroyTbodyEl
     * @private
     */
    _destroyTbodyEl : function() {
        var elTbody = this._elTbody;
        if(elTbody) {
            var elTable = elTbody.parentNode;
            Ev.purgeElement(elTbody, true);
            elTable.removeChild(elTbody);
            this._elTbody = null;
        }
    },

    /**
     * Initializes TBODY element for data.
     *
     * @method _initTbodyEl
     * @param elTable {HTMLElement} TABLE element into which to create TBODY .
     * @private
     */
    _initTbodyEl : function(elTable) {
        if(elTable) {
            // Destroy previous
            this._destroyTbodyEl();

            // Create TBODY
            var elTbody = elTable.appendChild(document.createElement("tbody"));
            elTbody.tabIndex = 0;
            elTbody.className = DT.CLASS_DATA;

            // Set up DOM events for TBODY
            Ev.addListener(elTbody, "focus", this._onTbodyFocus, this);
            Ev.addListener(elTbody, "mousedown", this._onTableMousedown, this);
            Ev.addListener(elTbody, "mouseup", this._onTableMouseup, this);
            Ev.addListener(elTbody, "keydown", this._onTbodyKeydown, this);
            Ev.addListener(elTbody, "click", this._onTbodyClick, this);

            // Bug 2528073: mouseover/mouseout handled via mouseenter/mouseleave
            // delegation at the TABLE level

            // Since we can't listen for click and dblclick on the same element...
            // Attach separately to THEAD and TBODY
            ///Ev.addListener(elTbody, "dblclick", this._onTableDblclick, this);

            // IE puts focus outline in the wrong place
            if(ua.ie) {
                elTbody.hideFocus=true;
            }

            this._elTbody = elTbody;
        }
    },

    /**
     * Destroy's the DataTable message TBODY element, if available.
     *
     * @method _destroyMsgTbodyEl
     * @private
     */
    _destroyMsgTbodyEl : function() {
        var elMsgTbody = this._elMsgTbody;
        if(elMsgTbody) {
            var elTable = elMsgTbody.parentNode;
            Ev.purgeElement(elMsgTbody, true);
            elTable.removeChild(elMsgTbody);
            this._elTbody = null;
        }
    },

    /**
     * Initializes TBODY element for messaging.
     *
     * @method _initMsgTbodyEl
     * @param elTable {HTMLElement} TABLE element into which to create TBODY
     * @private
     */
    _initMsgTbodyEl : function(elTable) {
        if(elTable) {
            var elMsgTbody = document.createElement("tbody");
            elMsgTbody.className = DT.CLASS_MESSAGE;
            var elMsgTr = elMsgTbody.appendChild(document.createElement("tr"));
            elMsgTr.className = DT.CLASS_FIRST + " " + DT.CLASS_LAST;
            this._elMsgTr = elMsgTr;
            var elMsgTd = elMsgTr.appendChild(document.createElement("td"));
            elMsgTd.colSpan = this._oColumnSet.keys.length || 1;
            elMsgTd.className = DT.CLASS_FIRST + " " + DT.CLASS_LAST;
            this._elMsgTd = elMsgTd;
            elMsgTbody = elTable.insertBefore(elMsgTbody, this._elTbody);
            var elMsgLiner = elMsgTd.appendChild(document.createElement("div"));
            elMsgLiner.className = DT.CLASS_LINER;
            this._elMsgTbody = elMsgTbody;

            // Set up DOM events for TBODY
            Ev.addListener(elMsgTbody, "focus", this._onTbodyFocus, this);
            Ev.addListener(elMsgTbody, "mousedown", this._onTableMousedown, this);
            Ev.addListener(elMsgTbody, "mouseup", this._onTableMouseup, this);
            Ev.addListener(elMsgTbody, "keydown", this._onTbodyKeydown, this);
            Ev.addListener(elMsgTbody, "click", this._onTbodyClick, this);

            // Bug 2528073: mouseover/mouseout handled via mouseenter/mouseleave
            // delegation at the TABLE level
        }
    },

    /**
     * Initialize internal event listeners
     *
     * @method _initEvents
     * @private
     */
    _initEvents : function () {
        // Initialize Column sort
        this._initColumnSort();

        // Add the document level click listener
        YAHOO.util.Event.addListener(document, "click", this._onDocumentClick, this);

        // Paginator integration
        this.subscribe("paginatorChange",function () {
            this._handlePaginatorChange.apply(this,arguments);
        });

        this.subscribe("initEvent",function () {
            this.renderPaginator();
        });

        // Initialize CellEditor integration
        this._initCellEditing();
    },

    /**
      * Initializes Column sorting.
      *
      * @method _initColumnSort
      * @private
      */
    _initColumnSort : function() {
        this.subscribe("theadCellClickEvent", this.onEventSortColumn);

        // Backward compatibility
        var oSortedBy = this.get("sortedBy");
        if(oSortedBy) {
            if(oSortedBy.dir == "desc") {
                this._configs.sortedBy.value.dir = DT.CLASS_DESC;
            }
            else if(oSortedBy.dir == "asc") {
                this._configs.sortedBy.value.dir = DT.CLASS_ASC;
            }
        }
    },

    /**
      * Initializes CellEditor integration.
      *
      * @method _initCellEditing
      * @private
      */
    _initCellEditing : function() {
        this.subscribe("editorBlurEvent",function () {
            this.onEditorBlurEvent.apply(this,arguments);
        });
        this.subscribe("editorBlockEvent",function () {
            this.onEditorBlockEvent.apply(this,arguments);
        });
        this.subscribe("editorUnblockEvent",function () {
            this.onEditorUnblockEvent.apply(this,arguments);
        });
    },

    // DOM MUTATION FUNCTIONS

    /**
     * Retruns classnames to represent current Column states.
     * @method _getColumnClassnames
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param aAddClasses {String[]} An array of additional classnames to add to the
     * return value.
     * @return {String} A String of classnames to be assigned to TH or TD elements
     * for given Column.
     * @private
     */
    _getColumnClassNames : function (oColumn, aAddClasses) {
        var allClasses;

        // Add CSS classes
        if(lang.isString(oColumn.className)) {
            // Single custom class
            allClasses = [oColumn.className];
        }
        else if(lang.isArray(oColumn.className)) {
            // Array of custom classes
            allClasses = oColumn.className;
        }
        else {
            // no custom classes
            allClasses = [];
        }

        // Hook for setting width with via dynamic style uses key since ID is too disposable
        allClasses[allClasses.length] = this.getId() + "-col-" +oColumn.getSanitizedKey();

        // Column key - minus any chars other than "A-Z", "a-z", "0-9", "_", "-", ".", or ":"
        allClasses[allClasses.length] = "yui-dt-col-" +oColumn.getSanitizedKey();

        var isSortedBy = this.get("sortedBy") || {};
        // Sorted
        if(oColumn.key === isSortedBy.key) {
            allClasses[allClasses.length] = isSortedBy.dir || '';
        }
        // Hidden
        if(oColumn.hidden) {
            allClasses[allClasses.length] = DT.CLASS_HIDDEN;
        }
        // Selected
        if(oColumn.selected) {
            allClasses[allClasses.length] = DT.CLASS_SELECTED;
        }
        // Sortable
        if(oColumn.sortable) {
            allClasses[allClasses.length] = DT.CLASS_SORTABLE;
        }
        // Resizeable
        if(oColumn.resizeable) {
            allClasses[allClasses.length] = DT.CLASS_RESIZEABLE;
        }
        // Editable
        if(oColumn.editor) {
            allClasses[allClasses.length] = DT.CLASS_EDITABLE;
        }

        // Addtnl classes, including First/Last
        if(aAddClasses) {
            allClasses = allClasses.concat(aAddClasses);
        }

        return allClasses.join(' ');
    },

    /**
     * Clears TR element template in response to any Column state change.
     * @method _clearTrTemplateEl
     * @private
     */
    _clearTrTemplateEl : function () {
        this._elTrTemplate = null;
    },

    /**
     * Returns a new TR element template with TD elements classed with current
     * Column states.
     * @method _getTrTemplateEl
     * @return {HTMLElement} A TR element to be cloned and added to the DOM.
     * @private
     */
    _getTrTemplateEl : function (oRecord, index) {
        // Template is already available
        if(this._elTrTemplate) {
            return this._elTrTemplate;
        }
        // Template needs to be created
        else {
            var d   = document,
                tr  = d.createElement('tr'),
                td  = d.createElement('td'),
                div = d.createElement('div');

            // Append the liner element
            td.appendChild(div);

            // Create TD elements into DOCUMENT FRAGMENT
            var df = document.createDocumentFragment(),
                allKeys = this._oColumnSet.keys,
                elTd;

            // Set state for each TD;
            var aAddClasses;
            for(var i=0, keysLen=allKeys.length; i<keysLen; i++) {
                // Clone the TD template
                elTd = td.cloneNode(true);

                // Format the base TD
                elTd = this._formatTdEl(allKeys[i], elTd, i, (i===keysLen-1));

                df.appendChild(elTd);
            }
            tr.appendChild(df);
            tr.className = DT.CLASS_REC;
            this._elTrTemplate = tr;
            return tr;
        }
    },

    /**
     * Formats a basic TD element.
     * @method _formatTdEl
     * @param oColumn {YAHOO.widget.Column} Associated Column instance.
     * @param elTd {HTMLElement} An unformatted TD element.
     * @param index {Number} Column key index.
     * @param isLast {Boolean} True if Column is last key of the ColumnSet.
     * @return {HTMLElement} A formatted TD element.
     * @private
     */
    _formatTdEl : function (oColumn, elTd, index, isLast) {
        var oColumnSet = this._oColumnSet;

        // Set the TD's accessibility headers
        var allHeaders = oColumnSet.headers,
            allColHeaders = allHeaders[index],
            sTdHeaders = "",
            sHeader;
        for(var j=0, headersLen=allColHeaders.length; j < headersLen; j++) {
            sHeader = this._sId + "-th-" + allColHeaders[j] + ' ';
            sTdHeaders += sHeader;
        }
        elTd.headers = sTdHeaders;

        // Class the TD element
        var aAddClasses = [];
        if(index === 0) {
            aAddClasses[aAddClasses.length] = DT.CLASS_FIRST;
        }
        if(isLast) {
            aAddClasses[aAddClasses.length] = DT.CLASS_LAST;
        }
        elTd.className = this._getColumnClassNames(oColumn, aAddClasses);

        // Class the liner element
        elTd.firstChild.className = DT.CLASS_LINER;

        // Set Column width for fallback cases
        if(oColumn.width && DT._bDynStylesFallback) {
            // Validate minWidth
            var nWidth = (oColumn.minWidth && (oColumn.width < oColumn.minWidth)) ?
                    oColumn.minWidth : oColumn.width;
            elTd.firstChild.style.overflow = 'hidden';
            elTd.firstChild.style.width = nWidth + 'px';
        }

        return elTd;
    },

    /**
     * Create a new TR element for a given Record and appends it with the correct
     * number of Column-state-classed TD elements. Striping is the responsibility of
     * the calling function, which may decide to stripe the single row, a subset of
     * rows, or all the rows.
     * @method _createTrEl
     * @param oRecord {YAHOO.widget.Record} Record instance
     * @return {HTMLElement} The new TR element.  This must be added to the DOM.
     * @private
     */
    _addTrEl : function (oRecord) {
        var elTrTemplate = this._getTrTemplateEl();

        // Clone the TR template.
        var elTr = elTrTemplate.cloneNode(true);

        // Populate content
        return this._updateTrEl(elTr,oRecord);
    },

    /**
     * Formats the contents of the given TR's TD elements with data from the given
     * Record. Only innerHTML should change, nothing structural.
     *
     * @method _updateTrEl
     * @param elTr {HTMLElement} The TR element to update.
     * @param oRecord {YAHOO.widget.Record} The associated Record instance.
     * @return {HTMLElement} DOM reference to the new TR element.
     * @private
     */
    _updateTrEl : function(elTr, oRecord) {
        var ok = this.get("formatRow") ? this.get("formatRow").call(this, elTr, oRecord) : true;
        if(ok) {
            // Hide the row to prevent constant reflows
            elTr.style.display = 'none';

            // Update TD elements with new data
            var allTds = elTr.childNodes,
                elTd;
            for(var i=0,len=allTds.length; i<len; ++i) {
                elTd = allTds[i];

                // Set the cell content
                this.formatCell(allTds[i].firstChild, oRecord, this._oColumnSet.keys[i]);
            }

            // Redisplay the row for reflow
            elTr.style.display = '';
        }

         // Record-to-TR association and tracking of FIRST/LAST
        var oldId = elTr.id,
            newId = oRecord.getId();
        if(this._sFirstTrId === oldId) {
            this._sFirstTrId = newId;
        }
        if(this._sLastTrId === oldId) {
            this._sLastTrId = newId;
        }
        elTr.id = newId;
        return elTr;
    },

    /**
     * Deletes TR element by DOM reference or by DataTable page row index.
     *
     * @method _deleteTrEl
     * @param row {HTMLElement | Number} TR element reference or Datatable page row index.
     * @return {Boolean} Returns true if successful, else returns false.
     * @private
     */
    _deleteTrEl : function(row) {
        var rowIndex;

        // Get page row index for the element
        if(!lang.isNumber(row)) {
            rowIndex = Dom.get(row).sectionRowIndex;
        }
        else {
            rowIndex = row;
        }
        if(lang.isNumber(rowIndex) && (rowIndex > -2) && (rowIndex < this._elTbody.rows.length)) {
            // Cannot use tbody.deleteRow due to IE6 instability
            //return this._elTbody.deleteRow(rowIndex);
            return this._elTbody.removeChild(this._elTbody.rows[row]);
        }
        else {
            return null;
        }
    },

    // CSS/STATE FUNCTIONS

    /**
     * Removes the class YAHOO.widget.DataTable.CLASS_FIRST from the first TR element
     * of the DataTable page and updates internal tracker.
     *
     * @method _unsetFirstRow
     * @private
     */
    _unsetFirstRow : function() {
        // Remove FIRST
        if(this._sFirstTrId) {
            Dom.removeClass(this._sFirstTrId, DT.CLASS_FIRST);
            this._sFirstTrId = null;
        }
    },

    /**
     * Assigns the class YAHOO.widget.DataTable.CLASS_FIRST to the first TR element
     * of the DataTable page and updates internal tracker.
     *
     * @method _setFirstRow
     * @private
     */
    _setFirstRow : function() {
        this._unsetFirstRow();
        var elTr = this.getFirstTrEl();
        if(elTr) {
            // Set FIRST
            Dom.addClass(elTr, DT.CLASS_FIRST);
            this._sFirstTrId = elTr.id;
        }
    },

    /**
     * Removes the class YAHOO.widget.DataTable.CLASS_LAST from the last TR element
     * of the DataTable page and updates internal tracker.
     *
     * @method _unsetLastRow
     * @private
     */
    _unsetLastRow : function() {
        // Unassign previous class
        if(this._sLastTrId) {
            Dom.removeClass(this._sLastTrId, DT.CLASS_LAST);
            this._sLastTrId = null;
        }
    },

    /**
     * Assigns the class YAHOO.widget.DataTable.CLASS_LAST to the last TR element
     * of the DataTable page and updates internal tracker.
     *
     * @method _setLastRow
     * @private
     */
    _setLastRow : function() {
        this._unsetLastRow();
        var elTr = this.getLastTrEl();
        if(elTr) {
            // Assign class
            Dom.addClass(elTr, DT.CLASS_LAST);
            this._sLastTrId = elTr.id;
        }
    },

    /**
     * Assigns the classes DT.CLASS_EVEN and DT.CLASS_ODD to one, many, or all TR elements.
     *
     * @method _setRowStripes
     * @param row {HTMLElement | String | Number} (optional) HTML TR element reference
     * or string ID, or page row index of where to start striping.
     * @param range {Number} (optional) If given, how many rows to stripe, otherwise
     * stripe all the rows until the end.
     * @private
     */
    _setRowStripes : function(row, range) {
        // Default values stripe all rows
        var allRows = this._elTbody.rows,
            nStartIndex = 0,
            nEndIndex = allRows.length,
            aOdds = [], nOddIdx = 0,
            aEvens = [], nEvenIdx = 0;

        // Stripe a subset
        if((row !== null) && (row !== undefined)) {
            // Validate given start row
            var elStartRow = this.getTrEl(row);
            if(elStartRow) {
                nStartIndex = elStartRow.sectionRowIndex;

                // Validate given range
                if(lang.isNumber(range) && (range > 1)) {
                    nEndIndex = nStartIndex + range;
                }
            }
        }

        for(var i=nStartIndex; i<nEndIndex; i++) {
            if(i%2) {
                aOdds[nOddIdx++] = allRows[i];
            } else {
                aEvens[nEvenIdx++] = allRows[i];
            }
        }

        if (aOdds.length) {
            Dom.replaceClass(aOdds, DT.CLASS_EVEN, DT.CLASS_ODD);
        }

        if (aEvens.length) {
            Dom.replaceClass(aEvens, DT.CLASS_ODD, DT.CLASS_EVEN);
        }
    },

    /**
     * Assigns the class DT.CLASS_SELECTED to TR and TD elements.
     *
     * @method _setSelections
     * @private
     */
    _setSelections : function() {
        // Keep track of selected rows
        var allSelectedRows = this.getSelectedRows();
        // Keep track of selected cells
        var allSelectedCells = this.getSelectedCells();
        // Anything to select?
        if((allSelectedRows.length>0) || (allSelectedCells.length > 0)) {
            var oColumnSet = this._oColumnSet,
                el;
            // Loop over each row
            for(var i=0; i<allSelectedRows.length; i++) {
                el = Dom.get(allSelectedRows[i]);
                if(el) {
                    Dom.addClass(el, DT.CLASS_SELECTED);
                }
            }
            // Loop over each cell
            for(i=0; i<allSelectedCells.length; i++) {
                el = Dom.get(allSelectedCells[i].recordId);
                if(el) {
                    Dom.addClass(el.childNodes[oColumnSet.getColumn(allSelectedCells[i].columnKey).getKeyIndex()], DT.CLASS_SELECTED);
                }
            }
        }
    },

    /////////////////////////////////////////////////////////////////////////////
    //
    // Private DOM Event Handlers
    //
    /////////////////////////////////////////////////////////////////////////////

    /**
     * Validates minWidths whenever the render chain ends.
     *
     * @method _onRenderChainEnd
     * @private
     */
    _onRenderChainEnd : function() {
        // Hide loading message
        this.hideTableMessage();

        // Show empty message
        if(this._elTbody.rows.length === 0) {
            this.showTableMessage(this.get("MSG_EMPTY"), DT.CLASS_EMPTY);
        }

        // Execute in timeout thread to give implementers a chance
        // to subscribe after the constructor
        var oSelf = this;
        setTimeout(function() {
            if((oSelf instanceof DT) && oSelf._sId) {
                // Init event
                if(oSelf._bInit) {
                    oSelf._bInit = false;
                    oSelf.fireEvent("initEvent");
                }

                // Render event
                oSelf.fireEvent("renderEvent");
                // Backward compatibility
                oSelf.fireEvent("refreshEvent");
                YAHOO.log("DataTable rendered", "info", oSelf.toString());

                // Post-render routine
                oSelf.validateColumnWidths();

                // Post-render event
                oSelf.fireEvent("postRenderEvent");

                /*if(YAHOO.example.Performance.trialStart) {
                    YAHOO.log((new Date()).getTime() - YAHOO.example.Performance.trialStart.getTime() + " ms", "time");
                    YAHOO.example.Performance.trialStart = null;
                }*/

                YAHOO.log("Post-render routine executed", "info", oSelf.toString());
            }
        }, 0);
    },

    /**
     * Handles click events on the DOCUMENT.
     *
     * @method _onDocumentClick
     * @param e {HTMLEvent} The click event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onDocumentClick : function(e, oSelf) {
        var elTarget = Ev.getTarget(e);
        var elTag = elTarget.nodeName.toLowerCase();

        if(!Dom.isAncestor(oSelf._elContainer, elTarget)) {
            oSelf.fireEvent("tableBlurEvent");

            // Fires editorBlurEvent when click is not within the TABLE.
            // For cases when click is within the TABLE, due to timing issues,
            // the editorBlurEvent needs to get fired by the lower-level DOM click
            // handlers below rather than by the TABLE click handler directly.
            if(oSelf._oCellEditor) {
                if(oSelf._oCellEditor.getContainerEl) {
                    var elContainer = oSelf._oCellEditor.getContainerEl();
                    // Only if the click was not within the CellEditor container
                    if(!Dom.isAncestor(elContainer, elTarget) &&
                            (elContainer.id !== elTarget.id)) {
                        oSelf._oCellEditor.fireEvent("blurEvent", {editor: oSelf._oCellEditor});
                    }
                }
                // Backward Compatibility
                else if(oSelf._oCellEditor.isActive) {
                    // Only if the click was not within the Cell Editor container
                    if(!Dom.isAncestor(oSelf._oCellEditor.container, elTarget) &&
                            (oSelf._oCellEditor.container.id !== elTarget.id)) {
                        oSelf.fireEvent("editorBlurEvent", {editor:oSelf._oCellEditor});
                    }
                }
            }
        }
    },

    /**
     * Handles focus events on the DataTable instance.
     *
     * @method _onTableFocus
     * @param e {HTMLEvent} The focus event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTableFocus : function(e, oSelf) {
        oSelf.fireEvent("tableFocusEvent");
    },

    /**
     * Handles focus events on the THEAD element.
     *
     * @method _onTheadFocus
     * @param e {HTMLEvent} The focus event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTheadFocus : function(e, oSelf) {
        oSelf.fireEvent("theadFocusEvent");
        oSelf.fireEvent("tableFocusEvent");
    },

    /**
     * Handles focus events on the TBODY element.
     *
     * @method _onTbodyFocus
     * @param e {HTMLEvent} The focus event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTbodyFocus : function(e, oSelf) {
        oSelf.fireEvent("tbodyFocusEvent");
        oSelf.fireEvent("tableFocusEvent");
    },

    /**
     * Handles mouseover events on the DataTable instance.
     *
     * @method _onTableMouseover
     * @param e {HTMLEvent} The mouseover event.
     * @param origTarget {HTMLElement} The mouseenter delegated element.
     * @param container {HTMLElement} The mouseenter delegation container.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTableMouseover : function(e, origTarget, container, oSelf) {
        var elTarget = origTarget;
        var elTag = elTarget.nodeName && elTarget.nodeName.toLowerCase();
        var bKeepBubbling = true;
        while(elTarget && (elTag != "table")) {
            switch(elTag) {
                case "body":
                     return;
                case "a":
                    break;
                case "td":
                    bKeepBubbling = oSelf.fireEvent("cellMouseoverEvent",{target:elTarget,event:e});
                    break;
                case "span":
                    if(Dom.hasClass(elTarget, DT.CLASS_LABEL)) {
                        bKeepBubbling = oSelf.fireEvent("theadLabelMouseoverEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerLabelMouseoverEvent",{target:elTarget,event:e});
                    }
                    break;
                case "th":
                    bKeepBubbling = oSelf.fireEvent("theadCellMouseoverEvent",{target:elTarget,event:e});
                    // Backward compatibility
                    bKeepBubbling = oSelf.fireEvent("headerCellMouseoverEvent",{target:elTarget,event:e});
                    break;
                case "tr":
                    if(elTarget.parentNode.nodeName.toLowerCase() == "thead") {
                        bKeepBubbling = oSelf.fireEvent("theadRowMouseoverEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerRowMouseoverEvent",{target:elTarget,event:e});
                    }
                    else {
                        bKeepBubbling = oSelf.fireEvent("rowMouseoverEvent",{target:elTarget,event:e});
                    }
                    break;
                default:
                    break;
            }
            if(bKeepBubbling === false) {
                return;
            }
            else {
                elTarget = elTarget.parentNode;
                if(elTarget) {
                    elTag = elTarget.nodeName.toLowerCase();
                }
            }
        }
        oSelf.fireEvent("tableMouseoverEvent",{target:(elTarget || oSelf._elContainer),event:e});
    },

    /**
     * Handles mouseout events on the DataTable instance.
     *
     * @method _onTableMouseout
     * @param e {HTMLEvent} The mouseout event.
     * @param origTarget {HTMLElement} The mouseleave delegated element.
     * @param container {HTMLElement} The mouseleave delegation container.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTableMouseout : function(e, origTarget, container, oSelf) {
        var elTarget = origTarget;
        var elTag = elTarget.nodeName && elTarget.nodeName.toLowerCase();
        var bKeepBubbling = true;
        while(elTarget && (elTag != "table")) {
            switch(elTag) {
                case "body":
                    return;
                case "a":
                    break;
                case "td":
                    bKeepBubbling = oSelf.fireEvent("cellMouseoutEvent",{target:elTarget,event:e});
                    break;
                case "span":
                    if(Dom.hasClass(elTarget, DT.CLASS_LABEL)) {
                        bKeepBubbling = oSelf.fireEvent("theadLabelMouseoutEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerLabelMouseoutEvent",{target:elTarget,event:e});
                    }
                    break;
                case "th":
                    bKeepBubbling = oSelf.fireEvent("theadCellMouseoutEvent",{target:elTarget,event:e});
                    // Backward compatibility
                    bKeepBubbling = oSelf.fireEvent("headerCellMouseoutEvent",{target:elTarget,event:e});
                    break;
                case "tr":
                    if(elTarget.parentNode.nodeName.toLowerCase() == "thead") {
                        bKeepBubbling = oSelf.fireEvent("theadRowMouseoutEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerRowMouseoutEvent",{target:elTarget,event:e});
                    }
                    else {
                        bKeepBubbling = oSelf.fireEvent("rowMouseoutEvent",{target:elTarget,event:e});
                    }
                    break;
                default:
                    break;
            }
            if(bKeepBubbling === false) {
                return;
            }
            else {
                elTarget = elTarget.parentNode;
                if(elTarget) {
                    elTag = elTarget.nodeName.toLowerCase();
                }
            }
        }
        oSelf.fireEvent("tableMouseoutEvent",{target:(elTarget || oSelf._elContainer),event:e});
    },

    /**
     * Handles mousedown events on the DataTable instance.
     *
     * @method _onTableMousedown
     * @param e {HTMLEvent} The mousedown event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTableMousedown : function(e, oSelf) {
        var elTarget = Ev.getTarget(e);
        var elTag = elTarget.nodeName && elTarget.nodeName.toLowerCase();
        var bKeepBubbling = true;
        while(elTarget && (elTag != "table")) {
            switch(elTag) {
                case "body":
                    return;
                case "a":
                    break;
                case "td":
                    bKeepBubbling = oSelf.fireEvent("cellMousedownEvent",{target:elTarget,event:e});
                    break;
                case "span":
                    if(Dom.hasClass(elTarget, DT.CLASS_LABEL)) {
                        bKeepBubbling = oSelf.fireEvent("theadLabelMousedownEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerLabelMousedownEvent",{target:elTarget,event:e});
                    }
                    break;
                case "th":
                    bKeepBubbling = oSelf.fireEvent("theadCellMousedownEvent",{target:elTarget,event:e});
                    // Backward compatibility
                    bKeepBubbling = oSelf.fireEvent("headerCellMousedownEvent",{target:elTarget,event:e});
                    break;
                case "tr":
                    if(elTarget.parentNode.nodeName.toLowerCase() == "thead") {
                        bKeepBubbling = oSelf.fireEvent("theadRowMousedownEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerRowMousedownEvent",{target:elTarget,event:e});
                    }
                    else {
                        bKeepBubbling = oSelf.fireEvent("rowMousedownEvent",{target:elTarget,event:e});
                    }
                    break;
                default:
                    break;
            }
            if(bKeepBubbling === false) {
                return;
            }
            else {
                elTarget = elTarget.parentNode;
                if(elTarget) {
                    elTag = elTarget.nodeName.toLowerCase();
                }
            }
        }
        oSelf.fireEvent("tableMousedownEvent",{target:(elTarget || oSelf._elContainer),event:e});
    },

    /**
     * Handles mouseup events on the DataTable instance.
     *
     * @method _onTableMouseup
     * @param e {HTMLEvent} The mouseup event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTableMouseup : function(e, oSelf) {
        var elTarget = Ev.getTarget(e);
        var elTag = elTarget.nodeName && elTarget.nodeName.toLowerCase();
        var bKeepBubbling = true;
        while(elTarget && (elTag != "table")) {
            switch(elTag) {
                case "body":
                    return;
                case "a":
                    break;
                case "td":
                    bKeepBubbling = oSelf.fireEvent("cellMouseupEvent",{target:elTarget,event:e});
                    break;
                case "span":
                    if(Dom.hasClass(elTarget, DT.CLASS_LABEL)) {
                        bKeepBubbling = oSelf.fireEvent("theadLabelMouseupEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerLabelMouseupEvent",{target:elTarget,event:e});
                    }
                    break;
                case "th":
                    bKeepBubbling = oSelf.fireEvent("theadCellMouseupEvent",{target:elTarget,event:e});
                    // Backward compatibility
                    bKeepBubbling = oSelf.fireEvent("headerCellMouseupEvent",{target:elTarget,event:e});
                    break;
                case "tr":
                    if(elTarget.parentNode.nodeName.toLowerCase() == "thead") {
                        bKeepBubbling = oSelf.fireEvent("theadRowMouseupEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerRowMouseupEvent",{target:elTarget,event:e});
                    }
                    else {
                        bKeepBubbling = oSelf.fireEvent("rowMouseupEvent",{target:elTarget,event:e});
                    }
                    break;
                default:
                    break;
            }
            if(bKeepBubbling === false) {
                return;
            }
            else {
                elTarget = elTarget.parentNode;
                if(elTarget) {
                    elTag = elTarget.nodeName.toLowerCase();
                }
            }
        }
        oSelf.fireEvent("tableMouseupEvent",{target:(elTarget || oSelf._elContainer),event:e});
    },

    /**
     * Handles dblclick events on the DataTable instance.
     *
     * @method _onTableDblclick
     * @param e {HTMLEvent} The dblclick event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTableDblclick : function(e, oSelf) {
        var elTarget = Ev.getTarget(e);
        var elTag = elTarget.nodeName && elTarget.nodeName.toLowerCase();
        var bKeepBubbling = true;
        while(elTarget && (elTag != "table")) {
            switch(elTag) {
                case "body":
                    return;
                case "td":
                    bKeepBubbling = oSelf.fireEvent("cellDblclickEvent",{target:elTarget,event:e});
                    break;
                case "span":
                    if(Dom.hasClass(elTarget, DT.CLASS_LABEL)) {
                        bKeepBubbling = oSelf.fireEvent("theadLabelDblclickEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerLabelDblclickEvent",{target:elTarget,event:e});
                    }
                    break;
                case "th":
                    bKeepBubbling = oSelf.fireEvent("theadCellDblclickEvent",{target:elTarget,event:e});
                    // Backward compatibility
                    bKeepBubbling = oSelf.fireEvent("headerCellDblclickEvent",{target:elTarget,event:e});
                    break;
                case "tr":
                    if(elTarget.parentNode.nodeName.toLowerCase() == "thead") {
                        bKeepBubbling = oSelf.fireEvent("theadRowDblclickEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerRowDblclickEvent",{target:elTarget,event:e});
                    }
                    else {
                        bKeepBubbling = oSelf.fireEvent("rowDblclickEvent",{target:elTarget,event:e});
                    }
                    break;
                default:
                    break;
            }
            if(bKeepBubbling === false) {
                return;
            }
            else {
                elTarget = elTarget.parentNode;
                if(elTarget) {
                    elTag = elTarget.nodeName.toLowerCase();
                }
            }
        }
        oSelf.fireEvent("tableDblclickEvent",{target:(elTarget || oSelf._elContainer),event:e});
    },
    /**
     * Handles keydown events on the THEAD element.
     *
     * @method _onTheadKeydown
     * @param e {HTMLEvent} The key event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTheadKeydown : function(e, oSelf) {
        var elTarget = Ev.getTarget(e);
        var elTag = elTarget.nodeName && elTarget.nodeName.toLowerCase();
        var bKeepBubbling = true;
        while(elTarget && (elTag != "table")) {
            switch(elTag) {
                case "body":
                    return;
                case "input":
                case "textarea":
                    // TODO: implement textareaKeyEvent
                    break;
                case "thead":
                    bKeepBubbling = oSelf.fireEvent("theadKeyEvent",{target:elTarget,event:e});
                    break;
                default:
                    break;
            }
            if(bKeepBubbling === false) {
                return;
            }
            else {
                elTarget = elTarget.parentNode;
                if(elTarget) {
                    elTag = elTarget.nodeName.toLowerCase();
                }
            }
        }
        oSelf.fireEvent("tableKeyEvent",{target:(elTarget || oSelf._elContainer),event:e});
    },

    /**
     * Handles keydown events on the TBODY element. Handles selection behavior,
     * provides hooks for ENTER to edit functionality.
     *
     * @method _onTbodyKeydown
     * @param e {HTMLEvent} The key event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTbodyKeydown : function(e, oSelf) {
        var sMode = oSelf.get("selectionMode");

        if(sMode == "standard") {
            oSelf._handleStandardSelectionByKey(e);
        }
        else if(sMode == "single") {
            oSelf._handleSingleSelectionByKey(e);
        }
        else if(sMode == "cellblock") {
            oSelf._handleCellBlockSelectionByKey(e);
        }
        else if(sMode == "cellrange") {
            oSelf._handleCellRangeSelectionByKey(e);
        }
        else if(sMode == "singlecell") {
            oSelf._handleSingleCellSelectionByKey(e);
        }

        if(oSelf._oCellEditor) {
            if(oSelf._oCellEditor.fireEvent) {
                oSelf._oCellEditor.fireEvent("blurEvent", {editor: oSelf._oCellEditor});
            }
            else if(oSelf._oCellEditor.isActive) {
                oSelf.fireEvent("editorBlurEvent", {editor:oSelf._oCellEditor});
            }
        }

        var elTarget = Ev.getTarget(e);
        var elTag = elTarget.nodeName && elTarget.nodeName.toLowerCase();
        var bKeepBubbling = true;
        while(elTarget && (elTag != "table")) {
            switch(elTag) {
                case "body":
                    return;
                case "tbody":
                    bKeepBubbling = oSelf.fireEvent("tbodyKeyEvent",{target:elTarget,event:e});
                    break;
                default:
                    break;
            }
            if(bKeepBubbling === false) {
                return;
            }
            else {
                elTarget = elTarget.parentNode;
                if(elTarget) {
                    elTag = elTarget.nodeName.toLowerCase();
                }
            }
        }
        oSelf.fireEvent("tableKeyEvent",{target:(elTarget || oSelf._elContainer),event:e});
    },

    /**
     * Handles click events on the THEAD element.
     *
     * @method _onTheadClick
     * @param e {HTMLEvent} The click event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTheadClick : function(e, oSelf) {
        // This blurs the CellEditor
        if(oSelf._oCellEditor) {
            if(oSelf._oCellEditor.fireEvent) {
                oSelf._oCellEditor.fireEvent("blurEvent", {editor: oSelf._oCellEditor});
            }
            // Backward compatibility
            else if(oSelf._oCellEditor.isActive) {
                oSelf.fireEvent("editorBlurEvent", {editor:oSelf._oCellEditor});
            }
        }

        var elTarget = Ev.getTarget(e),
            elTag = elTarget.nodeName && elTarget.nodeName.toLowerCase(),
            bKeepBubbling = true;
        while(elTarget && (elTag != "table")) {
            switch(elTag) {
                case "body":
                    return;
                case "input":
                    var sType = elTarget.type.toLowerCase();
                    if(sType == "checkbox") {
                        bKeepBubbling = oSelf.fireEvent("theadCheckboxClickEvent",{target:elTarget,event:e});
                    }
                    else if(sType == "radio") {
                        bKeepBubbling = oSelf.fireEvent("theadRadioClickEvent",{target:elTarget,event:e});
                    }
                    else if((sType == "button") || (sType == "image") || (sType == "submit") || (sType == "reset")) {
                        if(!elTarget.disabled) {
                            bKeepBubbling = oSelf.fireEvent("theadButtonClickEvent",{target:elTarget,event:e});
                        }
                        else {
                            bKeepBubbling = false;
                        }
                    }
                    else if (elTarget.disabled){
                        bKeepBubbling = false;
                    }
                    break;
                case "a":
                    bKeepBubbling = oSelf.fireEvent("theadLinkClickEvent",{target:elTarget,event:e});
                    break;
                case "button":
                    if(!elTarget.disabled) {
                        bKeepBubbling = oSelf.fireEvent("theadButtonClickEvent",{target:elTarget,event:e});
                    }
                    else {
                        bKeepBubbling = false;
                    }
                    break;
                case "span":
                    if(Dom.hasClass(elTarget, DT.CLASS_LABEL)) {
                        bKeepBubbling = oSelf.fireEvent("theadLabelClickEvent",{target:elTarget,event:e});
                        // Backward compatibility
                        bKeepBubbling = oSelf.fireEvent("headerLabelClickEvent",{target:elTarget,event:e});
                    }
                    break;
                case "th":
                    bKeepBubbling = oSelf.fireEvent("theadCellClickEvent",{target:elTarget,event:e});
                    // Backward compatibility
                    bKeepBubbling = oSelf.fireEvent("headerCellClickEvent",{target:elTarget,event:e});
                    break;
                case "tr":
                    bKeepBubbling = oSelf.fireEvent("theadRowClickEvent",{target:elTarget,event:e});
                    // Backward compatibility
                    bKeepBubbling = oSelf.fireEvent("headerRowClickEvent",{target:elTarget,event:e});
                    break;
                default:
                    break;
            }
            if(bKeepBubbling === false) {
                return;
            }
            else {
                elTarget = elTarget.parentNode;
                if(elTarget) {
                    elTag = elTarget.nodeName.toLowerCase();
                }
            }
        }
        oSelf.fireEvent("tableClickEvent",{target:(elTarget || oSelf._elContainer),event:e});
    },

    /**
     * Handles click events on the primary TBODY element.
     *
     * @method _onTbodyClick
     * @param e {HTMLEvent} The click event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onTbodyClick : function(e, oSelf) {
        // This blurs the CellEditor
        if(oSelf._oCellEditor) {
            if(oSelf._oCellEditor.fireEvent) {
                oSelf._oCellEditor.fireEvent("blurEvent", {editor: oSelf._oCellEditor});
            }
            else if(oSelf._oCellEditor.isActive) {
                oSelf.fireEvent("editorBlurEvent", {editor:oSelf._oCellEditor});
            }
        }

        // Fire Custom Events
        var elTarget = Ev.getTarget(e),
            elTag = elTarget.nodeName && elTarget.nodeName.toLowerCase(),
            bKeepBubbling = true;
        while(elTarget && (elTag != "table")) {
            switch(elTag) {
                case "body":
                    return;
                case "input":
                    var sType = elTarget.type.toLowerCase();
                    if(sType == "checkbox") {
                        bKeepBubbling = oSelf.fireEvent("checkboxClickEvent",{target:elTarget,event:e});
                    }
                    else if(sType == "radio") {
                        bKeepBubbling = oSelf.fireEvent("radioClickEvent",{target:elTarget,event:e});
                    }
                    else if((sType == "button") || (sType == "image") || (sType == "submit") || (sType == "reset")) {
                        if(!elTarget.disabled) {
                            bKeepBubbling = oSelf.fireEvent("buttonClickEvent",{target:elTarget,event:e});
                        }
                        else {
                            bKeepBubbling = false;
                        }
                    }
                    else if (elTarget.disabled){
                        bKeepBubbling = false;
                    }
                    break;
                case "a":
                    bKeepBubbling = oSelf.fireEvent("linkClickEvent",{target:elTarget,event:e});
                    break;
                case "button":
                    if(!elTarget.disabled) {
                        bKeepBubbling = oSelf.fireEvent("buttonClickEvent",{target:elTarget,event:e});
                    }
                    else {
                        bKeepBubbling = false;
                    }
                    break;
                case "td":
                    bKeepBubbling = oSelf.fireEvent("cellClickEvent",{target:elTarget,event:e});
                    break;
                case "tr":
                    bKeepBubbling = oSelf.fireEvent("rowClickEvent",{target:elTarget,event:e});
                    break;
                default:
                    break;
            }
            if(bKeepBubbling === false) {
                return;
            }
            else {
                elTarget = elTarget.parentNode;
                if(elTarget) {
                    elTag = elTarget.nodeName.toLowerCase();
                }
            }
        }
        oSelf.fireEvent("tableClickEvent",{target:(elTarget || oSelf._elContainer),event:e});
    },

    /**
     * Handles change events on SELECT elements within DataTable.
     *
     * @method _onDropdownChange
     * @param e {HTMLEvent} The change event.
     * @param oSelf {YAHOO.wiget.DataTable} DataTable instance.
     * @private
     */
    _onDropdownChange : function(e, oSelf) {
        var elTarget = Ev.getTarget(e);
        oSelf.fireEvent("dropdownChangeEvent", {event:e, target:elTarget});
    },

    /////////////////////////////////////////////////////////////////////////////
    //
    // Public member variables
    //
    /////////////////////////////////////////////////////////////////////////////
    /**
     * Returns object literal of initial configs.
     *
     * @property configs
     * @type Object
     * @default {}
     */
    configs: null,

    /////////////////////////////////////////////////////////////////////////////
    //
    // Public methods
    //
    /////////////////////////////////////////////////////////////////////////////

    /**
     * Returns unique id assigned to instance, which is a useful prefix for
     * generating unique DOM ID strings.
     *
     * @method getId
     * @return {String} Unique ID of the DataSource instance.
     */
    getId : function() {
        return this._sId;
    },

    /**
     * DataSource instance name, for logging.
     *
     * @method toString
     * @return {String} Unique name of the DataSource instance.
     */

    toString : function() {
        return "DataTable instance " + this._sId;
    },

    /**
     * Returns the DataTable instance's DataSource instance.
     *
     * @method getDataSource
     * @return {YAHOO.util.DataSource} DataSource instance.
     */
    getDataSource : function() {
        return this._oDataSource;
    },

    /**
     * Returns the DataTable instance's ColumnSet instance.
     *
     * @method getColumnSet
     * @return {YAHOO.widget.ColumnSet} ColumnSet instance.
     */
    getColumnSet : function() {
        return this._oColumnSet;
    },

    /**
     * Returns the DataTable instance's RecordSet instance.
     *
     * @method getRecordSet
     * @return {YAHOO.widget.RecordSet} RecordSet instance.
     */
    getRecordSet : function() {
        return this._oRecordSet;
    },

    /**
     * Returns on object literal representing the DataTable instance's current
     * state with the following properties:
     * <dl>
     * <dt>pagination</dt>
     * <dd>Instance of YAHOO.widget.Paginator</dd>
     *
     * <dt>sortedBy</dt>
     * <dd>
     *     <dl>
     *         <dt>sortedBy.key</dt>
     *         <dd>{String} Key of sorted Column</dd>
     *         <dt>sortedBy.dir</dt>
     *         <dd>{String} Initial sort direction, either YAHOO.widget.DataTable.CLASS_ASC or YAHOO.widget.DataTable.CLASS_DESC</dd>
     *     </dl>
     * </dd>
     *
     * <dt>selectedRows</dt>
     * <dd>Array of selected rows by Record ID.</dd>
     *
     * <dt>selectedCells</dt>
     * <dd>Selected cells as an array of object literals:
     *     {recordId:sRecordId, columnKey:sColumnKey}</dd>
     * </dl>
     *
     * @method getState
     * @return {Object} DataTable instance state object literal values.
     */
    getState : function() {
        return {
            totalRecords: this.get('paginator') ? this.get('paginator').get("totalRecords") : this._oRecordSet.getLength(),
            pagination: this.get("paginator") ? this.get("paginator").getState() : null,
            sortedBy: this.get("sortedBy"),
            selectedRows: this.getSelectedRows(),
            selectedCells: this.getSelectedCells()
        };
    },

    // DOM ACCESSORS

    /**
     * Returns DOM reference to the DataTable's container element.
     *
     * @method getContainerEl
     * @return {HTMLElement} Reference to DIV element.
     */
    getContainerEl : function() {
        return this._elContainer;
    },

    /**
     * Returns DOM reference to the DataTable's TABLE element.
     *
     * @method getTableEl
     * @return {HTMLElement} Reference to TABLE element.
     */
    getTableEl : function() {
        return this._elTable;
    },

    /**
     * Returns DOM reference to the DataTable's THEAD element.
     *
     * @method getTheadEl
     * @return {HTMLElement} Reference to THEAD element.
     */
    getTheadEl : function() {
        return this._elThead;
    },

    /**
     * Returns DOM reference to the DataTable's primary TBODY element.
     *
     * @method getTbodyEl
     * @return {HTMLElement} Reference to TBODY element.
     */
    getTbodyEl : function() {
        return this._elTbody;
    },

    /**
     * Returns DOM reference to the DataTable's secondary TBODY element that is
     * used to display messages.
     *
     * @method getMsgTbodyEl
     * @return {HTMLElement} Reference to TBODY element.
     */
    getMsgTbodyEl : function() {
        return this._elMsgTbody;
    },

    /**
     * Returns DOM reference to the TD element within the secondary TBODY that is
     * used to display messages.
     *
     * @method getMsgTdEl
     * @return {HTMLElement} Reference to TD element.
     */
    getMsgTdEl : function() {
        return this._elMsgTd;
    },

    /**
     * Returns the corresponding TR reference for a given DOM element, ID string or
     * page row index. If the given identifier is a child of a TR element,
     * then DOM tree is traversed until a parent TR element is returned, otherwise
     * null. Returns null if the row is not considered a primary row (i.e., row
     * extensions).
     *
     * @method getTrEl
     * @param row {HTMLElement | String | Number | YAHOO.widget.Record} Which row to
     * get: by element reference, ID string, page row index, or Record.
     * @return {HTMLElement} Reference to TR element, or null.
     */
    getTrEl : function(row) {
        // By Record
        if(row instanceof YAHOO.widget.Record) {
            return document.getElementById(row.getId());
        }
        // By page row index
        else if(lang.isNumber(row)) {
            var dataRows = Dom.getElementsByClassName(DT.CLASS_REC, "tr", this._elTbody);
            return dataRows && dataRows[row] ? dataRows[row] : null;
        }
        // By ID string or element reference
        else if(row) {
            var elRow = (lang.isString(row)) ? document.getElementById(row) : row;

            // Validate HTML element
            if(elRow && elRow.ownerDocument == document) {
                // Validate TR element
                if(elRow.nodeName.toLowerCase() != "tr") {
                    // Traverse up the DOM to find the corresponding TR element
                    elRow = Dom.getAncestorByTagName(elRow,"tr");
                }

                return elRow;
            }
        }

        return null;
    },

    /**
     * Returns DOM reference to the first primary TR element in the DataTable page, or null.
     *
     * @method getFirstTrEl
     * @return {HTMLElement} Reference to TR element.
     */
    getFirstTrEl : function() {
        var allRows = this._elTbody.rows,
            i=0;
        while(allRows[i]) {
            if(this.getRecord(allRows[i])) {
                return allRows[i];
            }
            i++;
        }
        return null;

    },

    /**
     * Returns DOM reference to the last primary TR element in the DataTable page, or null.
     *
     * @method getLastTrEl
     * @return {HTMLElement} Reference to last TR element.
     */
    getLastTrEl : function() {
        var allRows = this._elTbody.rows,
            i=allRows.length-1;
        while(i>-1) {
            if(this.getRecord(allRows[i])) {
                return allRows[i];
            }
            i--;
        }
        return null;
    },

    /**
     * Returns DOM reference to the next TR element from the given primary TR element, or null.
     *
     * @method getNextTrEl
     * @param row {HTMLElement | String | Number | YAHOO.widget.Record} Element
     * reference, ID string, page row index, or Record from which to get next TR element.
     * @param forcePrimary {Boolean} (optional) If true, will only return TR elements
     * that correspond to Records. Non-primary rows (such as row expansions)
     * will be skipped.
     * @return {HTMLElement} Reference to next TR element.
     */
    getNextTrEl : function(row, forcePrimary) {
        var nThisTrIndex = this.getTrIndex(row);
        if(nThisTrIndex !== null) {
            var allRows = this._elTbody.rows;
            if(forcePrimary) {
                while(nThisTrIndex < allRows.length-1) {
                    row = allRows[nThisTrIndex+1];
                    if(this.getRecord(row)) {
                        return row;
                    }
                    nThisTrIndex++;
                }
            }
            else {
                if(nThisTrIndex < allRows.length-1) {
                    return allRows[nThisTrIndex+1];
                }
            }
        }

        YAHOO.log("Could not get next TR element for row " + row, "info", this.toString());
        return null;
    },

    /**
     * Returns DOM reference to the previous TR element from the given primary TR element, or null.
     *
     * @method getPreviousTrEl
     * @param row {HTMLElement | String | Number | YAHOO.widget.Record} Element
     * reference, ID string, page row index, or Record from which to get previous TR element.
     * @param forcePrimary {Boolean} (optional) If true, will only return TR elements
     * from rothat correspond to Records. Non-primary rows (such as row expansions)
     * will be skipped.
     * @return {HTMLElement} Reference to previous TR element.
     */
    getPreviousTrEl : function(row, forcePrimary) {
        var nThisTrIndex = this.getTrIndex(row);
        if(nThisTrIndex !== null) {
            var allRows = this._elTbody.rows;

            if(forcePrimary) {
                while(nThisTrIndex > 0) {
                    row = allRows[nThisTrIndex-1];
                    if(this.getRecord(row)) {
                        return row;
                    }
                    nThisTrIndex--;
                }
            }
            else {
                if(nThisTrIndex > 0) {
                    return allRows[nThisTrIndex-1];
                }
            }
        }

        YAHOO.log("Could not get previous TR element for row " + row, "info", this.toString());
        return null;
    },

    /**
     * Workaround for IE bug where hidden or not-in-dom elements cause cellIndex
     * value to be incorrect.
     *
     * @method getCellIndex
     * @param cell {HTMLElement | Object} TD element or child of a TD element, or
     * object literal of syntax {record:oRecord, column:oColumn}.
     * @return {Number} TD.cellIndex value.
     */
    getCellIndex : function(cell) {
        cell = this.getTdEl(cell);
        if(cell) {
            if(ua.ie > 0) {
                var i=0,
                    tr = cell.parentNode,
                    allCells = tr.childNodes,
                    len = allCells.length;
                for(; i<len; i++) {
                    if(allCells[i] == cell) {
                        return i;
                    }
                }
            }
            else {
                return cell.cellIndex;
            }
        }
    },

    /**
     * Returns DOM reference to a TD liner element.
     *
     * @method getTdLinerEl
     * @param cell {HTMLElement | Object} TD element or child of a TD element, or
     * object literal of syntax {record:oRecord, column:oColumn}.
     * @return {HTMLElement} Reference to TD liner element.
     */
    getTdLinerEl : function(cell) {
        var elCell = this.getTdEl(cell);
        return elCell.firstChild || null;
    },

    /**
     * Returns DOM reference to a TD element. Returns null if the row is not
     * considered a primary row (i.e., row extensions).
     *
     * @method getTdEl
     * @param cell {HTMLElement | String | Object} TD element or child of a TD element, or
     * object literal of syntax {record:oRecord, column:oColumn}.
     * @return {HTMLElement} Reference to TD element.
     */
    getTdEl : function(cell) {
        var elCell;
        var el = Dom.get(cell);

        // Validate HTML element
        if(el && (el.ownerDocument == document)) {
            // Validate TD element
            if(el.nodeName.toLowerCase() != "td") {
                // Traverse up the DOM to find the corresponding TR element
                elCell = Dom.getAncestorByTagName(el, "td");
            }
            else {
                elCell = el;
            }

            // Make sure the TD is in this TBODY or is not in DOM
            // Bug 2527707 and bug 2263558
            if(elCell && ((elCell.parentNode.parentNode == this._elTbody) ||
                (elCell.parentNode.parentNode === null) ||
                (elCell.parentNode.parentNode.nodeType === 11))) {
                // Now we can return the TD element
                return elCell;
            }
        }
        else if(cell) {
            var oRecord, nColKeyIndex;

            if(lang.isString(cell.columnKey) && lang.isString(cell.recordId)) {
                oRecord = this.getRecord(cell.recordId);
                var oColumn = this.getColumn(cell.columnKey);
                if(oColumn) {
                    nColKeyIndex = oColumn.getKeyIndex();
                }

            }
            if(cell.record && cell.column && cell.column.getKeyIndex) {
                oRecord = cell.record;
                nColKeyIndex = cell.column.getKeyIndex();
            }
            var elRow = this.getTrEl(oRecord);
            if((nColKeyIndex !== null) && elRow && elRow.cells && elRow.cells.length > 0) {
                return elRow.cells[nColKeyIndex] || null;
            }
        }

        return null;
    },

    /**
     * Returns DOM reference to the first primary TD element in the DataTable page (by default),
     * the first TD element of the optionally given row, or null.
     *
     * @method getFirstTdEl
     * @param row {HTMLElement} (optional) row from which to get first TD
     * @return {HTMLElement} Reference to TD element.
     */
    getFirstTdEl : function(row) {
        var elRow = lang.isValue(row) ? this.getTrEl(row) : this.getFirstTrEl();
        if(elRow) {
            if(elRow.cells && elRow.cells.length > 0) {
                return elRow.cells[0];
            }
            else if(elRow.childNodes && elRow.childNodes.length > 0) {
                return elRow.childNodes[0];
            }
        }
        YAHOO.log("Could not get first TD element for row " + elRow, "info", this.toString());
        return null;
    },

    /**
     * Returns DOM reference to the last primary TD element in the DataTable page (by default),
     * the first TD element of the optionally given row, or null.
     *
     * @method getLastTdEl
     * @param row {HTMLElement} (optional) row from which to get first TD
     * @return {HTMLElement} Reference to last TD element.
     */
    getLastTdEl : function(row) {
        var elRow = lang.isValue(row) ? this.getTrEl(row) : this.getLastTrEl();
        if(elRow) {
            if(elRow.cells && elRow.cells.length > 0) {
                return elRow.cells[elRow.cells.length-1];
            }
            else if(elRow.childNodes && elRow.childNodes.length > 0) {
                return elRow.childNodes[elRow.childNodes.length-1];
            }
        }
        YAHOO.log("Could not get last TD element for row " + elRow, "info", this.toString());
        return null;
    },

    /**
     * Returns DOM reference to the next TD element from the given cell, or null.
     *
     * @method getNextTdEl
     * @param cell {HTMLElement | String | Object} DOM element reference or string ID, or
     * object literal of syntax {record:oRecord, column:oColumn} from which to get next TD element.
     * @return {HTMLElement} Reference to next TD element, or null.
     */
    getNextTdEl : function(cell) {
        var elCell = this.getTdEl(cell);
        if(elCell) {
            var nThisTdIndex = this.getCellIndex(elCell);
            var elRow = this.getTrEl(elCell);
            if(elRow.cells && (elRow.cells.length) > 0 && (nThisTdIndex < elRow.cells.length-1)) {
                return elRow.cells[nThisTdIndex+1];
            }
            else if(elRow.childNodes && (elRow.childNodes.length) > 0 && (nThisTdIndex < elRow.childNodes.length-1)) {
                return elRow.childNodes[nThisTdIndex+1];
            }
            else {
                var elNextRow = this.getNextTrEl(elRow);
                if(elNextRow) {
                    return elNextRow.cells[0];
                }
            }
        }
        YAHOO.log("Could not get next TD element for cell " + cell, "info", this.toString());
        return null;
    },

    /**
     * Returns DOM reference to the previous TD element from the given cell, or null.
     *
     * @method getPreviousTdEl
     * @param cell {HTMLElement | String | Object} DOM element reference or string ID, or
     * object literal of syntax {record:oRecord, column:oColumn} from which to get previous TD element.
     * @return {HTMLElement} Reference to previous TD element, or null.
     */
    getPreviousTdEl : function(cell) {
        var elCell = this.getTdEl(cell);
        if(elCell) {
            var nThisTdIndex = this.getCellIndex(elCell);
            var elRow = this.getTrEl(elCell);
            if(nThisTdIndex > 0) {
                if(elRow.cells && elRow.cells.length > 0) {
                    return elRow.cells[nThisTdIndex-1];
                }
                else if(elRow.childNodes && elRow.childNodes.length > 0) {
                    return elRow.childNodes[nThisTdIndex-1];
                }
            }
            else {
                var elPreviousRow = this.getPreviousTrEl(elRow);
                if(elPreviousRow) {
                    return this.getLastTdEl(elPreviousRow);
                }
            }
        }
        YAHOO.log("Could not get next TD element for cell " + cell, "info", this.toString());
        return null;
    },

    /**
     * Returns DOM reference to the above TD element from the given cell, or null.
     *
     * @method getAboveTdEl
     * @param cell {HTMLElement | String | Object} DOM element reference or string ID, or
     * object literal of syntax {record:oRecord, column:oColumn} from which to get next TD element.
     * @param forcePrimary {Boolean} (optional) If true, will only return TD elements
     * from rows that correspond to Records. Non-primary rows (such as row expansions)
     * will be skipped.
     * @return {HTMLElement} Reference to above TD element, or null.
     */
    getAboveTdEl : function(cell, forcePrimary) {
        var elCell = this.getTdEl(cell);
        if(elCell) {
            var elPreviousRow = this.getPreviousTrEl(elCell, forcePrimary);
            if(elPreviousRow ) {
                var cellIndex = this.getCellIndex(elCell);
                if(elPreviousRow.cells && elPreviousRow.cells.length > 0) {
                    return elPreviousRow.cells[cellIndex] ? elPreviousRow.cells[cellIndex] : null;
                }
                else if(elPreviousRow.childNodes && elPreviousRow.childNodes.length > 0) {
                    return elPreviousRow.childNodes[cellIndex] ? elPreviousRow.childNodes[cellIndex] : null;
                }
            }
        }
        YAHOO.log("Could not get above TD element for cell " + cell, "info", this.toString());
        return null;
    },

    /**
     * Returns DOM reference to the below TD element from the given cell, or null.
     *
     * @method getBelowTdEl
     * @param cell {HTMLElement | String | Object} DOM element reference or string ID, or
     * object literal of syntax {record:oRecord, column:oColumn} from which to get previous TD element.
     * @param forcePrimary {Boolean} (optional) If true, will only return TD elements
     * from rows that correspond to Records. Non-primary rows (such as row expansions)
     * will be skipped.
     * @return {HTMLElement} Reference to below TD element, or null.
     */
    getBelowTdEl : function(cell, forcePrimary) {
        var elCell = this.getTdEl(cell);
        if(elCell) {
            var elNextRow = this.getNextTrEl(elCell, forcePrimary);
            if(elNextRow) {
                var cellIndex = this.getCellIndex(elCell);
                if(elNextRow.cells && elNextRow.cells.length > 0) {
                    return elNextRow.cells[cellIndex] ? elNextRow.cells[cellIndex] : null;
                }
                else if(elNextRow.childNodes && elNextRow.childNodes.length > 0) {
                    return elNextRow.childNodes[cellIndex] ? elNextRow.childNodes[cellIndex] : null;
                }
            }
        }
        YAHOO.log("Could not get below TD element for cell " + cell, "info", this.toString());
        return null;
    },

    /**
     * Returns DOM reference to a TH liner element. Needed to normalize for resizeable
     * Columns, which have an additional resizer liner DIV element between the TH
     * element and the liner DIV element.
     *
     * @method getThLinerEl
     * @param theadCell {YAHOO.widget.Column | HTMLElement | String} Column instance,
     * DOM element reference, or string ID.
     * @return {HTMLElement} Reference to TH liner element.
     */
    getThLinerEl : function(theadCell) {
        var oColumn = this.getColumn(theadCell);
        return (oColumn) ? oColumn.getThLinerEl() : null;
    },

    /**
     * Returns DOM reference to a TH element.
     *
     * @method getThEl
     * @param theadCell {YAHOO.widget.Column | HTMLElement | String} Column instance,
     * DOM element reference, or string ID.
     * @return {HTMLElement} Reference to TH element.
     */
    getThEl : function(theadCell) {
        var elTh;

        // Validate Column instance
        if(theadCell instanceof YAHOO.widget.Column) {
            var oColumn = theadCell;
            elTh = oColumn.getThEl();
            if(elTh) {
                return elTh;
            }
        }
        // Validate HTML element
        else {
            var el = Dom.get(theadCell);

            if(el && (el.ownerDocument == document)) {
                // Validate TH element
                if(el.nodeName.toLowerCase() != "th") {
                    // Traverse up the DOM to find the corresponding TR element
                    elTh = Dom.getAncestorByTagName(el,"th");
                }
                else {
                    elTh = el;
                }

                return elTh;
            }
        }

        return null;
    },

    /**
     * Returns the page row index of given primary row. Returns null if the row is not on the
     * current DataTable page, or if row is not considered a primary row (i.e., row
     * extensions).
     *
     * @method getTrIndex
     * @param row {HTMLElement | String | YAHOO.widget.Record | Number} DOM or ID
     * string reference to an element within the DataTable page, a Record instance,
     * or a Record's RecordSet index.
     * @return {Number} Page row index, or null if data row does not exist or is not on current page.
     */
    getTrIndex : function(row) {
        var record = this.getRecord(row),
            index = this.getRecordIndex(record),
            tr;
        if(record) {
            tr = this.getTrEl(record);
            if(tr) {
                return tr.sectionRowIndex;
            }
            else {
                var oPaginator = this.get("paginator");
                if(oPaginator) {
                    return oPaginator.get('recordOffset') + index;
                }
                else {
                    return index;
                }
            }
        }
        YAHOO.log("Could not get page row index for row " + row, "info", this.toString());
        return null;
    },

    // TABLE FUNCTIONS

    /**
     * Loads new data. Convenience method that calls DataSource's sendRequest()
     * method under the hood.
     *
     * @method load
     * @param oConfig {object} Optional configuration parameters:
     *
     * <dl>
     * <dt>request</dt><dd>Pass in a new request, or initialRequest is used.</dd>
     * <dt>callback</dt><dd>Pass in DataSource sendRequest() callback object, or the following is used:
     *    <dl>
     *      <dt>success</dt><dd>datatable.onDataReturnInitializeTable</dd>
     *      <dt>failure</dt><dd>datatable.onDataReturnInitializeTable</dd>
     *      <dt>scope</dt><dd>datatable</dd>
     *      <dt>argument</dt><dd>datatable.getState()</dd>
     *    </dl>
     * </dd>
     * <dt>datasource</dt><dd>Pass in a new DataSource instance to override the current DataSource for this transaction.</dd>
     * </dl>
     */
    load : function(oConfig) {
        oConfig = oConfig || {};

        (oConfig.datasource || this._oDataSource).sendRequest(oConfig.request || this.get("initialRequest"), oConfig.callback || {
            success: this.onDataReturnInitializeTable,
            failure: this.onDataReturnInitializeTable,
            scope: this,
            argument: this.getState()
        });
    },

    /**
     * Resets a RecordSet with the given data and populates the page view
     * with the new data. Any previous data, and selection and sort states are
     * cleared. New data should be added as a separate step.
     *
     * @method initializeTable
     */
    initializeTable : function() {
        // Reset init flag
        this._bInit = true;

        // Clear the RecordSet
        this._oRecordSet.reset();

        // Clear the Paginator's totalRecords if paginating
        var pag = this.get('paginator');
        if (pag) {
            pag.set('totalRecords',0);
        }

        // Clear selections
        this._unselectAllTrEls();
        this._unselectAllTdEls();
        this._aSelections = null;
        this._oAnchorRecord = null;
        this._oAnchorCell = null;

        // Clear sort
        this.set("sortedBy", null);
    },

    /**
     * Internal wrapper calls run() on render Chain instance.
     *
     * @method _runRenderChain
     * @private
     */
    _runRenderChain : function() {
        this._oChainRender.run();
    },

    /**
     * Returns array of Records for current view. For example, if paginated, it
     * returns the subset of Records for current page.
     *
     * @method _getViewRecords
     * @protected
     * @return {Array} Array of Records to display in current view.
     */
    _getViewRecords : function() {
        // Paginator is enabled, show a subset of Records
        var oPaginator = this.get('paginator');
        if(oPaginator) {
            return this._oRecordSet.getRecords(
                            oPaginator.getStartIndex(),
                            oPaginator.getRowsPerPage());
        }
        // Not paginated, show all records
        else {
            return this._oRecordSet.getRecords();
        }

    },

    /**
     * Renders the view with existing Records from the RecordSet while
     * maintaining sort, pagination, and selection states. For performance, reuses
     * existing DOM elements when possible while deleting extraneous elements.
     *
     * @method render
     */
    render : function() {
    //YAHOO.example.Performance.trialStart = new Date();

        this._oChainRender.stop();

        this.fireEvent("beforeRenderEvent");
        YAHOO.log("DataTable rendering...", "info", this.toString());

        var i, j, k, len,
            allRecords = this._getViewRecords();

        // From the top, update in-place existing rows, so as to reuse DOM elements
        var elTbody = this._elTbody,
            loopN = this.get("renderLoopSize"),
            nRecordsLength = allRecords.length;

        // Table has rows
        if(nRecordsLength > 0) {
            elTbody.style.display = "none";
            while(elTbody.lastChild) {
                elTbody.removeChild(elTbody.lastChild);
            }
            elTbody.style.display = "";

            // Set up the loop Chain to render rows
            this._oChainRender.add({
                method: function(oArg) {
                    if((this instanceof DT) && this._sId) {
                        var i = oArg.nCurrentRecord,
                            endRecordIndex = ((oArg.nCurrentRecord+oArg.nLoopLength) > nRecordsLength) ?
                                    nRecordsLength : (oArg.nCurrentRecord+oArg.nLoopLength),
                            elRow, nextSibling;

                        elTbody.style.display = "none";

                        for(; i<endRecordIndex; i++) {
                            elRow = Dom.get(allRecords[i].getId());
                            elRow = elRow || this._addTrEl(allRecords[i]);
                            nextSibling = elTbody.childNodes[i] || null;
                            elTbody.insertBefore(elRow, nextSibling);
                        }
                        elTbody.style.display = "";

                        // Set up for the next loop
                        oArg.nCurrentRecord = i;
                    }
                },
                scope: this,
                iterations: (loopN > 0) ? Math.ceil(nRecordsLength/loopN) : 1,
                argument: {
                    nCurrentRecord: 0,//nRecordsLength-1,  // Start at first Record
                    nLoopLength: (loopN > 0) ? loopN : nRecordsLength
                },
                timeout: (loopN > 0) ? 0 : -1
            });

            // Post-render tasks
            this._oChainRender.add({
                method: function(oArg) {
                    if((this instanceof DT) && this._sId) {
                        while(elTbody.rows.length > nRecordsLength) {
                            elTbody.removeChild(elTbody.lastChild);
                        }
                        this._setFirstRow();
                        this._setLastRow();
                        this._setRowStripes();
                        this._setSelections();
                    }
                },
                scope: this,
                timeout: (loopN > 0) ? 0 : -1
            });

        }
        // Table has no rows
        else {
            // Set up the loop Chain to delete rows
            var nTotal = elTbody.rows.length;
            if(nTotal > 0) {
                this._oChainRender.add({
                    method: function(oArg) {
                        if((this instanceof DT) && this._sId) {
                            var i = oArg.nCurrent,
                                loopN = oArg.nLoopLength,
                                nIterEnd = (i - loopN < 0) ? 0 : i - loopN;

                            elTbody.style.display = "none";

                            for(; i>nIterEnd; i--) {
                                elTbody.deleteRow(-1);
                            }
                            elTbody.style.display = "";

                            // Set up for the next loop
                            oArg.nCurrent = i;
                        }
                    },
                    scope: this,
                    iterations: (loopN > 0) ? Math.ceil(nTotal/loopN) : 1,
                    argument: {
                        nCurrent: nTotal,
                        nLoopLength: (loopN > 0) ? loopN : nTotal
                    },
                    timeout: (loopN > 0) ? 0 : -1
                });
            }
        }
        this._runRenderChain();
    },

    /**
     * Disables DataTable UI.
     *
     * @method disable
     */
    disable : function() {
        this._disabled = true;
        var elTable = this._elTable;
        var elMask = this._elMask;
        elMask.style.width = elTable.offsetWidth + "px";
        elMask.style.height = elTable.offsetHeight + "px";
        elMask.style.left = elTable.offsetLeft + "px";
        elMask.style.display = "";
        this.fireEvent("disableEvent");
    },

    /**
     * Undisables DataTable UI.
     *
     * @method undisable
     */
    undisable : function() {
        this._disabled = false;
        this._elMask.style.display = "none";
        this.fireEvent("undisableEvent");
    },

     /**
     * Returns disabled state.
     *
     * @method isDisabled
     * @return {Boolean} True if UI is disabled, otherwise false
     */
    isDisabled : function() {
        return this._disabled;
    },

    /**
     * Nulls out the entire DataTable instance and related objects, removes attached
     * event listeners, and clears out DOM elements inside the container. After
     * calling this method, the instance reference should be expliclitly nulled by
     * implementer, as in myDataTable = null. Use with caution!
     *
     * @method destroy
     */
    destroy : function() {
        // Store for later
        var instanceName = this.toString();

        this._oChainRender.stop();

        // Destroy ColumnDD and ColumnResizers
        this._destroyColumnHelpers();

        // Destroy all CellEditors
        var oCellEditor;
        for(var i=0, len=this._oColumnSet.flat.length; i<len; i++) {
            oCellEditor = this._oColumnSet.flat[i].editor;
            if(oCellEditor && oCellEditor.destroy) {
                oCellEditor.destroy();
                this._oColumnSet.flat[i].editor = null;
            }
        }

        // Destroy Paginator
        this._destroyPaginator();

        // Unhook custom events
        this._oRecordSet.unsubscribeAll();
        this.unsubscribeAll();

        // Unhook DOM events
        Ev.removeListener(document, "click", this._onDocumentClick);

        // Clear out the container
        this._destroyContainerEl(this._elContainer);

        // Null out objects
        for(var param in this) {
            if(lang.hasOwnProperty(this, param)) {
                this[param] = null;
            }
        }

        // Clean up static values
        DT._nCurrentCount--;

        if(DT._nCurrentCount < 1) {
            if(DT._elDynStyleNode) {
                document.getElementsByTagName('head')[0].removeChild(DT._elDynStyleNode);
                DT._elDynStyleNode = null;
            }
        }

        YAHOO.log("DataTable instance destroyed: " + instanceName);
    },

    /**
     * Displays message within secondary TBODY.
     *
     * @method showTableMessage
     * @param sHTML {HTML} (optional) Value for innerHTML.
     * @param sClassName {String} (optional) Classname.
     */
    showTableMessage : function(sHTML, sClassName) {
        var elCell = this._elMsgTd;
        if(lang.isString(sHTML)) {
            elCell.firstChild.innerHTML = sHTML;
        }
        if(lang.isString(sClassName)) {
            elCell.className = sClassName;
        }

        this._elMsgTbody.style.display = "";

        this.fireEvent("tableMsgShowEvent", {html:sHTML, className:sClassName});
        YAHOO.log("DataTable showing message: " + sHTML, "info", this.toString());
    },

    /**
     * Hides secondary TBODY.
     *
     * @method hideTableMessage
     */
    hideTableMessage : function() {
        if(this._elMsgTbody.style.display != "none") {
            this._elMsgTbody.style.display = "none";
            this._elMsgTbody.parentNode.style.width = "";
            this.fireEvent("tableMsgHideEvent");
            YAHOO.log("DataTable message hidden", "info", this.toString());
        }
    },

    /**
     * Brings focus to the TBODY element. Alias to focusTbodyEl.
     *
     * @method focus
     */
    focus : function() {
        this.focusTbodyEl();
    },

    /**
     * Brings focus to the THEAD element.
     *
     * @method focusTheadEl
     */
    focusTheadEl : function() {
        this._focusEl(this._elThead);
    },

    /**
     * Brings focus to the TBODY element.
     *
     * @method focusTbodyEl
     */
    focusTbodyEl : function() {
        this._focusEl(this._elTbody);
    },

    /**
     * Setting display:none on DataTable or any parent may impact width validations.
     * After setting display back to "", implementers should call this method to
     * manually perform those validations.
     *
     * @method onShow
     */
    onShow : function() {
        this.validateColumnWidths();

        for(var allKeys = this._oColumnSet.keys, i=0, len=allKeys.length, col; i<len; i++) {
            col = allKeys[i];
            if(col._ddResizer) {
                col._ddResizer.resetResizerEl();
            }
        }
    },

    // RECORDSET FUNCTIONS

    /**
     * Returns Record index for given TR element or page row index.
     *
     * @method getRecordIndex
     * @param row {YAHOO.widget.Record | HTMLElement | Number} Record instance, TR
     * element reference or page row index.
     * @return {Number} Record's RecordSet index, or null.
     */
    getRecordIndex : function(row) {
        var nTrIndex;

        if(!lang.isNumber(row)) {
            // By Record
            if(row instanceof YAHOO.widget.Record) {
                return this._oRecordSet.getRecordIndex(row);
            }
            // By element reference
            else {
                // Find the TR element
                var el = this.getTrEl(row);
                if(el) {
                    nTrIndex = el.sectionRowIndex;
                }
            }
        }
        // By page row index
        else {
            nTrIndex = row;
        }

        if(lang.isNumber(nTrIndex)) {
            var oPaginator = this.get("paginator");
            if(oPaginator) {
                return oPaginator.get('recordOffset') + nTrIndex;
            }
            else {
                return nTrIndex;
            }
        }

        YAHOO.log("Could not get Record index for row " + row, "info", this.toString());
        return null;
    },

    /**
     * For the given identifier, returns the associated Record instance.
     *
     * @method getRecord
     * @param row {HTMLElement | Number | String} DOM reference to a TR element (or
     * child of a TR element), RecordSet position index, or Record ID.
     * @return {YAHOO.widget.Record} Record instance.
     */
    getRecord : function(row) {
        var oRecord = this._oRecordSet.getRecord(row);

        if(!oRecord) {
            // Validate TR element
            var elRow = this.getTrEl(row);
            if(elRow) {
                oRecord = this._oRecordSet.getRecord(elRow.id);
            }
        }

        if(oRecord instanceof YAHOO.widget.Record) {
            return this._oRecordSet.getRecord(oRecord);
        }
        else {
            YAHOO.log("Could not get Record for row at " + row, "info", this.toString());
            return null;
        }
    },

    // COLUMN FUNCTIONS

    /**
     * For the given identifier, returns the associated Column instance. Note: For
     * getting Columns by Column ID string, please use the method getColumnById().
     *
     * @method getColumn
     * @param column {HTMLElement | String | Number} TH/TD element (or child of a
     * TH/TD element), a Column key, or a ColumnSet key index.
     * @return {YAHOO.widget.Column} Column instance.
     */
    getColumn : function(column) {
        var oColumn = this._oColumnSet.getColumn(column);

        if(!oColumn) {
            // Validate TD element
            var elCell = this.getTdEl(column);
            if(elCell) {
                oColumn = this._oColumnSet.getColumn(this.getCellIndex(elCell));
            }
            // Validate TH element
            else {
                elCell = this.getThEl(column);
                if(elCell) {
                    // Find by TH el ID
                    var allColumns = this._oColumnSet.flat;
                    for(var i=0, len=allColumns.length; i<len; i++) {
                        if(allColumns[i].getThEl().id === elCell.id) {
                            oColumn = allColumns[i];
                        }
                    }
                }
            }
        }
        if(!oColumn) {
            YAHOO.log("Could not get Column for column at " + column, "info", this.toString());
        }
        return oColumn;
    },

    /**
     * For the given Column ID, returns the associated Column instance. Note: For
     * getting Columns by key, please use the method getColumn().
     *
     * @method getColumnById
     * @param column {String} Column ID string.
     * @return {YAHOO.widget.Column} Column instance.
     */
    getColumnById : function(column) {
        return this._oColumnSet.getColumnById(column);
    },

    /**
     * For the given Column instance, returns next direction to sort.
     *
     * @method getColumnSortDir
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param oSortedBy {Object} (optional) Specify the state, or use current state.
     * @return {String} YAHOO.widget.DataTable.CLASS_ASC or YAHOO.widget.DataTableCLASS_DESC.
     */
    getColumnSortDir : function(oColumn, oSortedBy) {
        // Backward compatibility
        if(oColumn.sortOptions && oColumn.sortOptions.defaultDir) {
            if(oColumn.sortOptions.defaultDir == "asc") {
                oColumn.sortOptions.defaultDir = DT.CLASS_ASC;
            }
            else if (oColumn.sortOptions.defaultDir == "desc") {
                oColumn.sortOptions.defaultDir = DT.CLASS_DESC;
            }
        }

        // What is the Column's default sort direction?
        var sortDir = (oColumn.sortOptions && oColumn.sortOptions.defaultDir) ? oColumn.sortOptions.defaultDir : DT.CLASS_ASC;

        // Is the Column currently sorted?
        var bSorted = false;
        oSortedBy = oSortedBy || this.get("sortedBy");
        if(oSortedBy && (oSortedBy.key === oColumn.key)) {
            bSorted = true;
            if(oSortedBy.dir) {
                sortDir = (oSortedBy.dir === DT.CLASS_ASC) ? DT.CLASS_DESC : DT.CLASS_ASC;
            }
            else {
                sortDir = (sortDir === DT.CLASS_ASC) ? DT.CLASS_DESC : DT.CLASS_ASC;
            }
        }
        return sortDir;
    },

    /**
     * Overridable method gives implementers a hook to show loading message before
     * sorting Column.
     *
     * @method doBeforeSortColumn
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param sSortDir {String} YAHOO.widget.DataTable.CLASS_ASC or
     * YAHOO.widget.DataTable.CLASS_DESC.
     * @return {Boolean} Return true to continue sorting Column.
     */
    doBeforeSortColumn : function(oColumn, sSortDir) {
        this.showTableMessage(this.get("MSG_LOADING"), DT.CLASS_LOADING);
        return true;
    },

    /**
     * Sorts given Column. If "dynamicData" is true, current selections are purged before
     * a request is sent to the DataSource for data for the new state (using the
     * request returned by "generateRequest()").
     *
     * @method sortColumn
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param sDir {String} (Optional) YAHOO.widget.DataTable.CLASS_ASC or
     * YAHOO.widget.DataTable.CLASS_DESC
     */
    sortColumn : function(oColumn, sDir) {
        if(oColumn && (oColumn instanceof YAHOO.widget.Column)) {
            if(!oColumn.sortable) {
                Dom.addClass(this.getThEl(oColumn), DT.CLASS_SORTABLE);
            }

            // Validate given direction
            if(sDir && (sDir !== DT.CLASS_ASC) && (sDir !== DT.CLASS_DESC)) {
                sDir = null;
            }

            // Get the sort dir
            var sSortDir = sDir || this.getColumnSortDir(oColumn);

            // Is the Column currently sorted?
            var oSortedBy = this.get("sortedBy") || {};
            var bSorted = (oSortedBy.key === oColumn.key) ? true : false;

            var ok = this.doBeforeSortColumn(oColumn, sSortDir);
            if(ok) {
                // Server-side sort
                if(this.get("dynamicData")) {
                    // Get current state
                    var oState = this.getState();

                    // Reset record offset, if paginated
                    if(oState.pagination) {
                        oState.pagination.recordOffset = 0;
                    }

                    // Update sortedBy to new values
                    oState.sortedBy = {
                        key: oColumn.key,
                        dir: sSortDir
                    };

                    // Get the request for the new state
                    var request = this.get("generateRequest")(oState, this);

                    // Purge selections
                    this.unselectAllRows();
                    this.unselectAllCells();

                    // Send request for new data
                    var callback = {
                        success : this.onDataReturnSetRows,
                        failure : this.onDataReturnSetRows,
                        argument : oState, // Pass along the new state to the callback
                        scope : this
                    };
                    this._oDataSource.sendRequest(request, callback);
                }
                // Client-side sort
                else {
                    // Is there a custom sort handler function defined?
                    var sortFnc = (oColumn.sortOptions && lang.isFunction(oColumn.sortOptions.sortFunction)) ?
                            // Custom sort function
                            oColumn.sortOptions.sortFunction : null;

                    // Sort the Records
                    if(!bSorted || sDir || sortFnc) {
                        // Default sort function if necessary
                        sortFnc = sortFnc || this.get("sortFunction");
                        // Get the field to sort
                        var sField = (oColumn.sortOptions && oColumn.sortOptions.field) ? oColumn.sortOptions.field : oColumn.field;

                        // Sort the Records
                        this._oRecordSet.sortRecords(sortFnc, ((sSortDir == DT.CLASS_DESC) ? true : false), sField);
                    }
                    // Just reverse the Records
                    else {
                        this._oRecordSet.reverseRecords();
                    }

                    // Reset to first page if paginated
                    var oPaginator = this.get('paginator');
                    if (oPaginator) {
                        // Set page silently, so as not to fire change event.
                        oPaginator.setPage(1,true);
                    }

                    // Update UI via sortedBy
                    this.render();
                    this.set("sortedBy", {key:oColumn.key, dir:sSortDir, column:oColumn});
                }

                this.fireEvent("columnSortEvent",{column:oColumn,dir:sSortDir});
                YAHOO.log("Column \"" + oColumn.key + "\" sorted \"" + sSortDir + "\"", "info", this.toString());
                return;
            }
        }
        YAHOO.log("Could not sort Column \"" + oColumn.key + "\"", "warn", this.toString());
    },

    /**
     * Sets given Column to given pixel width. If new width is less than minimum
     * width, sets to minimum width. Updates oColumn.width value.
     *
     * @method setColumnWidth
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param nWidth {Number} New width in pixels. A null value auto-sizes Column,
     * subject to minWidth and maxAutoWidth validations.
     */
    setColumnWidth : function(oColumn, nWidth) {
        if(!(oColumn instanceof YAHOO.widget.Column)) {
            oColumn = this.getColumn(oColumn);
        }
        if(oColumn) {
            // Validate new width against minimum width
            if(lang.isNumber(nWidth)) {
                // This is why we must require a Number... :-|
                nWidth = (nWidth > oColumn.minWidth) ? nWidth : oColumn.minWidth;

                // Save state
                oColumn.width = nWidth;

                // Resize the DOM elements
                this._setColumnWidth(oColumn, nWidth+"px");

                this.fireEvent("columnSetWidthEvent",{column:oColumn,width:nWidth});
                YAHOO.log("Set width of Column " + oColumn + " to " + nWidth + "px", "info", this.toString());
            }
            // Unsets a width to auto-size
            else if(nWidth === null) {
                // Save state
                oColumn.width = nWidth;

                // Resize the DOM elements
                this._setColumnWidth(oColumn, "auto");
                this.validateColumnWidths(oColumn);
                this.fireEvent("columnUnsetWidthEvent",{column:oColumn});
                YAHOO.log("Column " + oColumn + " width unset", "info", this.toString());
            }

            // Bug 2339454: resize then sort misaligment
            this._clearTrTemplateEl();
        }
        else {
            YAHOO.log("Could not set width of Column " + oColumn + " to " + nWidth + "px", "warn", this.toString());
        }
    },

    /**
     * Sets liner DIV elements of given Column to given width. When value should be
     * auto-calculated to fit content overflow is set to visible, otherwise overflow
     * is set to hidden. No validations against minimum width and no updating
     * Column.width value.
     *
     * @method _setColumnWidth
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param sWidth {String} New width value.
     * @param sOverflow {String} Should be "hidden" when Column width is explicitly
     * being set to a value, but should be "visible" when Column is meant to auto-fit content.
     * @private
     */
    _setColumnWidth : function(oColumn, sWidth, sOverflow) {
        if(oColumn && (oColumn.getKeyIndex() !== null)) {
            sOverflow = sOverflow || (((sWidth === '') || (sWidth === 'auto')) ? 'visible' : 'hidden');

            // Dynamic style algorithm
            if(!DT._bDynStylesFallback) {
                this._setColumnWidthDynStyles(oColumn, sWidth, sOverflow);
            }
            // Dynamic function algorithm
            else {
                this._setColumnWidthDynFunction(oColumn, sWidth, sOverflow);
            }
        }
        else {
            YAHOO.log("Could not set width of unknown Column " + oColumn + " to " + sWidth, "warn", this.toString());
        }
    },

    /**
     * Updates width of a Column's liner DIV elements by dynamically creating a
     * STYLE node and writing and updating CSS style rules to it. If this fails during
     * runtime, the fallback method _setColumnWidthDynFunction() will be called.
     * Notes: This technique is not performant in IE6. IE7 crashes if DataTable is
     * nested within another TABLE element. For these cases, it is recommended to
     * use the method _setColumnWidthDynFunction by setting _bDynStylesFallback to TRUE.
     *
     * @method _setColumnWidthDynStyles
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param sWidth {String} New width value.
     * @private
     */
    _setColumnWidthDynStyles : function(oColumn, sWidth, sOverflow) {
        var s = DT._elDynStyleNode,
            rule;

        // Create a new STYLE node
        if(!s) {
            s = document.createElement('style');
            s.type = 'text/css';
            s = document.getElementsByTagName('head').item(0).appendChild(s);
            DT._elDynStyleNode = s;
        }

        // We have a STYLE node to update
        if(s) {
            // Use unique classname for this Column instance as a hook for resizing
            var sClassname = "." + this.getId() + "-col-" + oColumn.getSanitizedKey() + " ." + DT.CLASS_LINER;

            // Hide for performance
            if(this._elTbody) {
                this._elTbody.style.display = 'none';
            }

            rule = DT._oDynStyles[sClassname];

            // The Column does not yet have a rule
            if(!rule) {
                if(s.styleSheet && s.styleSheet.addRule) {
                    s.styleSheet.addRule(sClassname,"overflow:"+sOverflow);
                    s.styleSheet.addRule(sClassname,'width:'+sWidth);
                    rule = s.styleSheet.rules[s.styleSheet.rules.length-1];
                    DT._oDynStyles[sClassname] = rule;
                }
                else if(s.sheet && s.sheet.insertRule) {
                    s.sheet.insertRule(sClassname+" {overflow:"+sOverflow+";width:"+sWidth+";}",s.sheet.cssRules.length);
                    rule = s.sheet.cssRules[s.sheet.cssRules.length-1];
                    DT._oDynStyles[sClassname] = rule;
                }
            }
            // We have a rule to update
            else {
                rule.style.overflow = sOverflow;
                rule.style.width = sWidth;
            }

            // Unhide
            if(this._elTbody) {
                this._elTbody.style.display = '';
            }
        }

        // That was not a success, we must call the fallback routine
        if(!rule) {
            DT._bDynStylesFallback = true;
            this._setColumnWidthDynFunction(oColumn, sWidth);
        }
    },

    /**
     * Updates width of a Column's liner DIV elements by dynamically creating a
     * function to update all element style properties in one pass. Note: This
     * technique is not supported in sandboxed environments that prohibit EVALs.
     *
     * @method _setColumnWidthDynFunction
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param sWidth {String} New width value.
     * @private
     */
    _setColumnWidthDynFunction : function(oColumn, sWidth, sOverflow) {
        // TODO: why is this here?
        if(sWidth == 'auto') {
            sWidth = '';
        }

        // Create one function for each value of rows.length
        var rowslen = this._elTbody ? this._elTbody.rows.length : 0;

        // Dynamically create the function
        if (!this._aDynFunctions[rowslen]) {

            //Compile a custom function to do all the liner div width
            //assignments at the same time.  A unique function is required
            //for each unique number of rows in _elTbody.  This will
            //result in a function declaration like:
            //function (oColumn,sWidth,sOverflow) {
            //    var colIdx = oColumn.getKeyIndex();
            //    oColumn.getThLinerEl().style.overflow =
            //    this._elTbody.rows[0].cells[colIdx].firstChild.style.overflow =
            //    this._elTbody.rows[1].cells[colIdx].firstChild.style.overflow =
            //    ... (for all row indices in this._elTbody.rows.length - 1)
            //    this._elTbody.rows[99].cells[colIdx].firstChild.style.overflow =
            //    sOverflow;
            //    oColumn.getThLinerEl().style.width =
            //    this._elTbody.rows[0].cells[colIdx].firstChild.style.width =
            //    this._elTbody.rows[1].cells[colIdx].firstChild.style.width =
            //    ... (for all row indices in this._elTbody.rows.length - 1)
            //    this._elTbody.rows[99].cells[colIdx].firstChild.style.width =
            //    sWidth;
            //}

            var i,j,k;
            var resizerDef = [
                'var colIdx=oColumn.getKeyIndex();',
                'oColumn.getThLinerEl().style.overflow='
            ];
            for (i=rowslen-1, j=2; i >= 0; --i) {
                resizerDef[j++] = 'this._elTbody.rows[';
                resizerDef[j++] = i;
                resizerDef[j++] = '].cells[colIdx].firstChild.style.overflow=';
            }
            resizerDef[j] = 'sOverflow;';
            resizerDef[j+1] = 'oColumn.getThLinerEl().style.width=';
            for (i=rowslen-1, k=j+2; i >= 0; --i) {
                resizerDef[k++] = 'this._elTbody.rows[';
                resizerDef[k++] = i;
                resizerDef[k++] = '].cells[colIdx].firstChild.style.width=';
            }
            resizerDef[k] = 'sWidth;';
            this._aDynFunctions[rowslen] =
                new Function('oColumn','sWidth','sOverflow',resizerDef.join(''));
        }

        // Get the function to execute
        var resizerFn = this._aDynFunctions[rowslen];

        // TODO: Hide TBODY for performance in _setColumnWidthDynFunction?
        if (resizerFn) {
            resizerFn.call(this,oColumn,sWidth,sOverflow);
        }
    },

    /**
     * For one or all Columns, when Column is not hidden, width is not set, and minWidth
     * and/or maxAutoWidth is set, validates auto-width against minWidth and maxAutoWidth.
     *
     * @method validateColumnWidths
     * @param oArg.column {YAHOO.widget.Column} (optional) One Column to validate. If null, all Columns' widths are validated.
     */
    validateColumnWidths : function(oColumn) {
        var elColgroup = this._elColgroup;
        var elColgroupClone = elColgroup.cloneNode(true);
        var bNeedsValidation = false;
        var allKeys = this._oColumnSet.keys;
        var elThLiner;
        // Validate just one Column's minWidth and/or maxAutoWidth
        if(oColumn && !oColumn.hidden && !oColumn.width && (oColumn.getKeyIndex() !== null)) {
                elThLiner = oColumn.getThLinerEl();
                if((oColumn.minWidth > 0) && (elThLiner.offsetWidth < oColumn.minWidth)) {
                    elColgroupClone.childNodes[oColumn.getKeyIndex()].style.width =
                            oColumn.minWidth +
                            (parseInt(Dom.getStyle(elThLiner,"paddingLeft"),10)|0) +
                            (parseInt(Dom.getStyle(elThLiner,"paddingRight"),10)|0) + "px";
                    bNeedsValidation = true;
                }
                else if((oColumn.maxAutoWidth > 0) && (elThLiner.offsetWidth > oColumn.maxAutoWidth)) {
                    this._setColumnWidth(oColumn, oColumn.maxAutoWidth+"px", "hidden");
                }
        }
        // Validate all Columns
        else {
            for(var i=0, len=allKeys.length; i<len; i++) {
                oColumn = allKeys[i];
                if(!oColumn.hidden && !oColumn.width) {
                    elThLiner = oColumn.getThLinerEl();
                    if((oColumn.minWidth > 0) && (elThLiner.offsetWidth < oColumn.minWidth)) {
                        elColgroupClone.childNodes[i].style.width =
                                oColumn.minWidth +
                                (parseInt(Dom.getStyle(elThLiner,"paddingLeft"),10)|0) +
                                (parseInt(Dom.getStyle(elThLiner,"paddingRight"),10)|0) + "px";
                        bNeedsValidation = true;
                    }
                    else if((oColumn.maxAutoWidth > 0) && (elThLiner.offsetWidth > oColumn.maxAutoWidth)) {
                        this._setColumnWidth(oColumn, oColumn.maxAutoWidth+"px", "hidden");
                    }
                }
            }
        }
        if(bNeedsValidation) {
            elColgroup.parentNode.replaceChild(elColgroupClone, elColgroup);
            this._elColgroup = elColgroupClone;
        }
    },

    /**
     * Clears minWidth.
     *
     * @method _clearMinWidth
     * @param oColumn {YAHOO.widget.Column} Which Column.
     * @private
     */
    _clearMinWidth : function(oColumn) {
        if(oColumn.getKeyIndex() !== null) {
            this._elColgroup.childNodes[oColumn.getKeyIndex()].style.width = '';
        }
    },

    /**
     * Restores minWidth.
     *
     * @method _restoreMinWidth
     * @param oColumn {YAHOO.widget.Column} Which Column.
     * @private
     */
    _restoreMinWidth : function(oColumn) {
        if(oColumn.minWidth && (oColumn.getKeyIndex() !== null)) {
            this._elColgroup.childNodes[oColumn.getKeyIndex()].style.width = oColumn.minWidth + 'px';
        }
    },

    /**
     * Hides given Column. NOTE: You cannot hide/show nested Columns. You can only
     * hide/show non-nested Columns, and top-level parent Columns (which will
     * hide/show all children Columns).
     *
     * @method hideColumn
     * @param oColumn {YAHOO.widget.Column | HTMLElement | String | Number} Column
     * instance, TH/TD element (or child of a TH/TD element), a Column key, or a
     * ColumnSet key index.
     */
    hideColumn : function(oColumn) {
        if(!(oColumn instanceof YAHOO.widget.Column)) {
            oColumn = this.getColumn(oColumn);
        }
        // Only top-level Columns can get hidden due to issues in FF2 and SF3
        if(oColumn && !oColumn.hidden && oColumn.getTreeIndex() !== null) {

            var allrows = this.getTbodyEl().rows;
            var l = allrows.length;
            var allDescendants = this._oColumnSet.getDescendants(oColumn);

            // Hide each nested Column
            for(var i=0, len=allDescendants.length; i<len; i++) {
                var thisColumn = allDescendants[i];
                thisColumn.hidden = true;

                // Style the head cell
                Dom.addClass(thisColumn.getThEl(), DT.CLASS_HIDDEN);

                // Does this Column have body cells?
                var thisKeyIndex = thisColumn.getKeyIndex();
                if(thisKeyIndex !== null) {
                    // Clear minWidth
                    this._clearMinWidth(oColumn);

                    // Style the body cells
                    for(var j=0;j<l;j++) {
                        Dom.addClass(allrows[j].cells[thisKeyIndex],DT.CLASS_HIDDEN);
                    }
                }

                this.fireEvent("columnHideEvent",{column:thisColumn});
                YAHOO.log("Column \"" + oColumn.key + "\" hidden", "info", this.toString());
            }

            this._repaintOpera();
            this._clearTrTemplateEl();
        }
        else {
            YAHOO.log("Could not hide Column \"" + lang.dump(oColumn) + "\". Only non-nested Columns can be hidden", "warn", this.toString());
        }
    },

    /**
     * Shows given Column. NOTE: You cannot hide/show nested Columns. You can only
     * hide/show non-nested Columns, and top-level parent Columns (which will
     * hide/show all children Columns).
     *
     * @method showColumn
     * @param oColumn {YAHOO.widget.Column | HTMLElement | String | Number} Column
     * instance, TH/TD element (or child of a TH/TD element), a Column key, or a
     * ColumnSet key index.
     */
    showColumn : function(oColumn) {
        if(!(oColumn instanceof YAHOO.widget.Column)) {
            oColumn = this.getColumn(oColumn);
        }
        // Only top-level Columns can get hidden
        if(oColumn && oColumn.hidden && (oColumn.getTreeIndex() !== null)) {
            var allrows = this.getTbodyEl().rows;
            var l = allrows.length;
            var allDescendants = this._oColumnSet.getDescendants(oColumn);

            // Show each nested Column
            for(var i=0, len=allDescendants.length; i<len; i++) {
                var thisColumn = allDescendants[i];
                thisColumn.hidden = false;

                // Unstyle the head cell
                Dom.removeClass(thisColumn.getThEl(), DT.CLASS_HIDDEN);

                // Does this Column have body cells?
                var thisKeyIndex = thisColumn.getKeyIndex();
                if(thisKeyIndex !== null) {
                    // Restore minWidth
                    this._restoreMinWidth(oColumn);

                    // Unstyle the body cells
                    for(var j=0;j<l;j++) {
                        Dom.removeClass(allrows[j].cells[thisKeyIndex],DT.CLASS_HIDDEN);
                    }
                }

                this.fireEvent("columnShowEvent",{column:thisColumn});
                YAHOO.log("Column \"" + oColumn.key + "\" shown", "info", this.toString());
            }
            this._clearTrTemplateEl();
        }
        else {
            YAHOO.log("Could not show Column \"" + lang.dump(oColumn) + "\". Only non-nested Columns can be shown", "warn", this.toString());
        }
    },

    /**
     * Removes given Column. NOTE: You cannot remove nested Columns. You can only remove
     * non-nested Columns, and top-level parent Columns (which will remove all
     * children Columns).
     *
     * @method removeColumn
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @return oColumn {YAHOO.widget.Column} Removed Column instance.
     */
    removeColumn : function(oColumn) {
        // Validate Column
        if(!(oColumn instanceof YAHOO.widget.Column)) {
            oColumn = this.getColumn(oColumn);
        }
        if(oColumn) {
            var nColTreeIndex = oColumn.getTreeIndex();
            if(nColTreeIndex !== null) {
                // Which key index(es)
                var i, len,
                    aKeyIndexes = oColumn.getKeyIndex();
                // Must be a parent Column
                if(aKeyIndexes === null) {
                    var descKeyIndexes = [];
                    var allDescendants = this._oColumnSet.getDescendants(oColumn);
                    for(i=0, len=allDescendants.length; i<len; i++) {
                        // Is this descendant a key Column?
                        var thisKey = allDescendants[i].getKeyIndex();
                        if(thisKey !== null) {
                            descKeyIndexes[descKeyIndexes.length] = thisKey;
                        }
                    }
                    if(descKeyIndexes.length > 0) {
                        aKeyIndexes = descKeyIndexes;
                    }
                }
                // Must be a key Column
                else {
                    aKeyIndexes = [aKeyIndexes];
                }

                if(aKeyIndexes !== null) {
                    // Sort the indexes so we can remove from the right
                    aKeyIndexes.sort(function(a, b) {return YAHOO.util.Sort.compare(a, b);});

                    // Destroy previous THEAD
                    this._destroyTheadEl();

                    // Create new THEAD
                    var aOrigColumnDefs = this._oColumnSet.getDefinitions();
                    oColumn = aOrigColumnDefs.splice(nColTreeIndex,1)[0];
                    this._initColumnSet(aOrigColumnDefs);
                    this._initTheadEl();

                    // Remove COL
                    for(i=aKeyIndexes.length-1; i>-1; i--) {
                        this._removeColgroupColEl(aKeyIndexes[i]);
                    }

                    // Remove TD
                    var allRows = this._elTbody.rows;
                    if(allRows.length > 0) {
                        var loopN = this.get("renderLoopSize"),
                            loopEnd = allRows.length;
                        this._oChainRender.add({
                            method: function(oArg) {
                                if((this instanceof DT) && this._sId) {
                                    var i = oArg.nCurrentRow,
                                        len = loopN > 0 ? Math.min(i + loopN,allRows.length) : allRows.length,
                                        aIndexes = oArg.aIndexes,
                                        j;
                                    for(; i < len; ++i) {
                                        for(j = aIndexes.length-1; j>-1; j--) {
                                            allRows[i].removeChild(allRows[i].childNodes[aIndexes[j]]);
                                        }
                                    }
                                    oArg.nCurrentRow = i;
                                }
                            },
                            iterations: (loopN > 0) ? Math.ceil(loopEnd/loopN) : 1,
                            argument: {nCurrentRow:0, aIndexes:aKeyIndexes},
                            scope: this,
                            timeout: (loopN > 0) ? 0 : -1
                        });
                        this._runRenderChain();
                    }

                    this.fireEvent("columnRemoveEvent",{column:oColumn});
                    YAHOO.log("Column \"" + oColumn.key + "\" removed", "info", this.toString());
                    return oColumn;
                }
            }
        }
        YAHOO.log("Could not remove Column \"" + oColumn.key + "\". Only non-nested Columns can be removed", "warn", this.toString());
    },

    /**
     * Inserts given Column at the index if given, otherwise at the end. NOTE: You
     * can only add non-nested Columns and top-level parent Columns. You cannot add
     * a nested Column to an existing parent.
     *
     * @method insertColumn
     * @param oColumn {Object | YAHOO.widget.Column} Object literal Column
     * definition or a Column instance.
     * @param index {Number} (optional) New tree index.
     * @return oColumn {YAHOO.widget.Column} Inserted Column instance.
     */
    insertColumn : function(oColumn, index) {
        // Validate Column
        if(oColumn instanceof YAHOO.widget.Column) {
            oColumn = oColumn.getDefinition();
        }
        else if(oColumn.constructor !== Object) {
            YAHOO.log("Could not insert Column \"" + oColumn + "\" due to invalid argument", "warn", this.toString());
            return;
        }

        // Validate index or append new Column to the end of the ColumnSet
        var oColumnSet = this._oColumnSet;
        if(!lang.isValue(index) || !lang.isNumber(index)) {
            index = oColumnSet.tree[0].length;
        }

        // Destroy previous THEAD
        this._destroyTheadEl();

        // Create new THEAD
        var aNewColumnDefs = this._oColumnSet.getDefinitions();
        aNewColumnDefs.splice(index, 0, oColumn);
        this._initColumnSet(aNewColumnDefs);
        this._initTheadEl();

        // Need to refresh the reference
        oColumnSet = this._oColumnSet;
        var oNewColumn = oColumnSet.tree[0][index];

        // Get key index(es) for new Column
        var i, len,
            descKeyIndexes = [];
        var allDescendants = oColumnSet.getDescendants(oNewColumn);
        for(i=0, len=allDescendants.length; i<len; i++) {
            // Is this descendant a key Column?
            var thisKey = allDescendants[i].getKeyIndex();
            if(thisKey !== null) {
                descKeyIndexes[descKeyIndexes.length] = thisKey;
            }
        }

        if(descKeyIndexes.length > 0) {
            // Sort the indexes
            var newIndex = descKeyIndexes.sort(function(a, b) {return YAHOO.util.Sort.compare(a, b);})[0];

            // Add COL
            for(i=descKeyIndexes.length-1; i>-1; i--) {
                this._insertColgroupColEl(descKeyIndexes[i]);
            }

            // Add TD
            var allRows = this._elTbody.rows;
            if(allRows.length > 0) {
                var loopN = this.get("renderLoopSize"),
                    loopEnd = allRows.length;

                // Get templates for each new TD
                var aTdTemplates = [],
                    elTdTemplate;
                for(i=0, len=descKeyIndexes.length; i<len; i++) {
                    var thisKeyIndex = descKeyIndexes[i];
                    elTdTemplate = this._getTrTemplateEl().childNodes[i].cloneNode(true);
                    elTdTemplate = this._formatTdEl(this._oColumnSet.keys[thisKeyIndex], elTdTemplate, thisKeyIndex, (thisKeyIndex===this._oColumnSet.keys.length-1));
                    aTdTemplates[thisKeyIndex] = elTdTemplate;
                }

                this._oChainRender.add({
                    method: function(oArg) {
                        if((this instanceof DT) && this._sId) {
                            var i = oArg.nCurrentRow, j,
                                descKeyIndexes = oArg.descKeyIndexes,
                                len = loopN > 0 ? Math.min(i + loopN,allRows.length) : allRows.length,
                                nextSibling;
                            for(; i < len; ++i) {
                                nextSibling = allRows[i].childNodes[newIndex] || null;
                                for(j=descKeyIndexes.length-1; j>-1; j--) {
                                    allRows[i].insertBefore(oArg.aTdTemplates[descKeyIndexes[j]].cloneNode(true), nextSibling);
                                }
                            }
                            oArg.nCurrentRow = i;
                        }
                    },
                    iterations: (loopN > 0) ? Math.ceil(loopEnd/loopN) : 1,
                    argument: {nCurrentRow:0,aTdTemplates:aTdTemplates,descKeyIndexes:descKeyIndexes},
                    scope: this,
                    timeout: (loopN > 0) ? 0 : -1
                });
                this._runRenderChain();
            }

            this.fireEvent("columnInsertEvent",{column:oColumn,index:index});
            YAHOO.log("Column \"" + oColumn.key + "\" inserted into index " + index, "info", this.toString());
            return oNewColumn;
        }
    },

    /**
     * Removes given Column and inserts into given tree index. NOTE: You
     * can only reorder non-nested Columns and top-level parent Columns. You cannot
     * reorder a nested Column to an existing parent.
     *
     * @method reorderColumn
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param index {Number} New tree index.
     * @return oColumn {YAHOO.widget.Column} Reordered Column instance.
     */
    reorderColumn : function(oColumn, index) {
        // Validate Column and new index
        if(!(oColumn instanceof YAHOO.widget.Column)) {
            oColumn = this.getColumn(oColumn);
        }
        if(oColumn && YAHOO.lang.isNumber(index)) {
            var nOrigTreeIndex = oColumn.getTreeIndex();
            if((nOrigTreeIndex !== null) && (nOrigTreeIndex !== index)) {
                // Which key index(es)
                var i, len,
                    aOrigKeyIndexes = oColumn.getKeyIndex(),
                    allDescendants,
                    descKeyIndexes = [],
                    thisKey;
                // Must be a parent Column...
                if(aOrigKeyIndexes === null) {
                    allDescendants = this._oColumnSet.getDescendants(oColumn);
                    for(i=0, len=allDescendants.length; i<len; i++) {
                        // Is this descendant a key Column?
                        thisKey = allDescendants[i].getKeyIndex();
                        if(thisKey !== null) {
                            descKeyIndexes[descKeyIndexes.length] = thisKey;
                        }
                    }
                    if(descKeyIndexes.length > 0) {
                        aOrigKeyIndexes = descKeyIndexes;
                    }
                }
                // ...or else must be a key Column
                else {
                    aOrigKeyIndexes = [aOrigKeyIndexes];
                }

                if(aOrigKeyIndexes !== null) {
                    // Sort the indexes
                    aOrigKeyIndexes.sort(function(a, b) {return YAHOO.util.Sort.compare(a, b);});

                    // Destroy previous THEAD
                    this._destroyTheadEl();

                    // Create new THEAD
                    var aColumnDefs = this._oColumnSet.getDefinitions();
                    var oColumnDef = aColumnDefs.splice(nOrigTreeIndex,1)[0];
                    aColumnDefs.splice(index, 0, oColumnDef);
                    this._initColumnSet(aColumnDefs);
                    this._initTheadEl();

                    // Need to refresh the reference
                    var oNewColumn = this._oColumnSet.tree[0][index];

                    // What are new key index(es)
                    var aNewKeyIndexes = oNewColumn.getKeyIndex();
                    // Must be a parent Column
                    if(aNewKeyIndexes === null) {
                        descKeyIndexes = [];
                        allDescendants = this._oColumnSet.getDescendants(oNewColumn);
                        for(i=0, len=allDescendants.length; i<len; i++) {
                            // Is this descendant a key Column?
                            thisKey = allDescendants[i].getKeyIndex();
                            if(thisKey !== null) {
                                descKeyIndexes[descKeyIndexes.length] = thisKey;
                            }
                        }
                        if(descKeyIndexes.length > 0) {
                            aNewKeyIndexes = descKeyIndexes;
                        }
                    }
                    // Must be a key Column
                    else {
                        aNewKeyIndexes = [aNewKeyIndexes];
                    }

                    // Sort the new indexes and grab the first one for the new location
                    var newIndex = aNewKeyIndexes.sort(function(a, b) {return YAHOO.util.Sort.compare(a, b);})[0];

                    // Reorder COL
                    this._reorderColgroupColEl(aOrigKeyIndexes, newIndex);

                    // Reorder TD
                    var allRows = this._elTbody.rows;
                    if(allRows.length > 0) {
                        var loopN = this.get("renderLoopSize"),
                            loopEnd = allRows.length;
                        this._oChainRender.add({
                            method: function(oArg) {
                                if((this instanceof DT) && this._sId) {
                                    var i = oArg.nCurrentRow, j, tmpTds, nextSibling,
                                        len = loopN > 0 ? Math.min(i + loopN,allRows.length) : allRows.length,
                                        aIndexes = oArg.aIndexes, thisTr;
                                    // For each row
                                    for(; i < len; ++i) {
                                        tmpTds = [];
                                        thisTr = allRows[i];

                                        // Remove each TD
                                        for(j=aIndexes.length-1; j>-1; j--) {
                                            tmpTds.push(thisTr.removeChild(thisTr.childNodes[aIndexes[j]]));
                                        }

                                        // Insert each TD
                                        nextSibling = thisTr.childNodes[newIndex] || null;
                                        for(j=tmpTds.length-1; j>-1; j--) {
                                            thisTr.insertBefore(tmpTds[j], nextSibling);
                                        }
                                    }
                                    oArg.nCurrentRow = i;
                                }
                            },
                            iterations: (loopN > 0) ? Math.ceil(loopEnd/loopN) : 1,
                            argument: {nCurrentRow:0, aIndexes:aOrigKeyIndexes},
                            scope: this,
                            timeout: (loopN > 0) ? 0 : -1
                        });
                        this._runRenderChain();
                    }

                    this.fireEvent("columnReorderEvent",{column:oNewColumn, oldIndex:nOrigTreeIndex});
                    YAHOO.log("Column \"" + oNewColumn.key + "\" reordered", "info", this.toString());
                    return oNewColumn;
                }
            }
        }
        YAHOO.log("Could not reorder Column \"" + oColumn.key + "\". Only non-nested Columns can be reordered", "warn", this.toString());
    },

    /**
     * Selects given Column. NOTE: You cannot select/unselect nested Columns. You can only
     * select/unselect non-nested Columns, and bottom-level key Columns.
     *
     * @method selectColumn
     * @param column {HTMLElement | String | Number} DOM reference or ID string to a
     * TH/TD element (or child of a TH/TD element), a Column key, or a ColumnSet key index.
     */
    selectColumn : function(oColumn) {
        oColumn = this.getColumn(oColumn);
        if(oColumn && !oColumn.selected) {
            // Only bottom-level Columns can get hidden
            if(oColumn.getKeyIndex() !== null) {
                oColumn.selected = true;

                // Update head cell
                var elTh = oColumn.getThEl();
                Dom.addClass(elTh,DT.CLASS_SELECTED);

                // Update body cells
                var allRows = this.getTbodyEl().rows;
                var oChainRender = this._oChainRender;
                oChainRender.add({
                    method: function(oArg) {
                        if((this instanceof DT) && this._sId && allRows[oArg.rowIndex] && allRows[oArg.rowIndex].cells[oArg.cellIndex]) {
                            Dom.addClass(allRows[oArg.rowIndex].cells[oArg.cellIndex],DT.CLASS_SELECTED);
                        }
                        oArg.rowIndex++;
                    },
                    scope: this,
                    iterations: allRows.length,
                    argument: {rowIndex:0,cellIndex:oColumn.getKeyIndex()}
                });

                this._clearTrTemplateEl();

                this._elTbody.style.display = "none";
                this._runRenderChain();
                this._elTbody.style.display = "";

                this.fireEvent("columnSelectEvent",{column:oColumn});
                YAHOO.log("Column \"" + oColumn.key + "\" selected", "info", this.toString());
            }
            else {
                YAHOO.log("Could not select Column \"" + oColumn.key + "\". Only non-nested Columns can be selected", "warn", this.toString());
            }
        }
    },

    /**
     * Unselects given Column. NOTE: You cannot select/unselect nested Columns. You can only
     * select/unselect non-nested Columns, and bottom-level key Columns.
     *
     * @method unselectColumn
     * @param column {HTMLElement | String | Number} DOM reference or ID string to a
     * TH/TD element (or child of a TH/TD element), a Column key, or a ColumnSet key index.
     */
    unselectColumn : function(oColumn) {
        oColumn = this.getColumn(oColumn);
        if(oColumn && oColumn.selected) {
            // Only bottom-level Columns can get hidden
            if(oColumn.getKeyIndex() !== null) {
                oColumn.selected = false;

                // Update head cell
                var elTh = oColumn.getThEl();
                Dom.removeClass(elTh,DT.CLASS_SELECTED);

                // Update body cells
                var allRows = this.getTbodyEl().rows;
                var oChainRender = this._oChainRender;
                oChainRender.add({
                    method: function(oArg) {
                        if((this instanceof DT) && this._sId && allRows[oArg.rowIndex] && allRows[oArg.rowIndex].cells[oArg.cellIndex]) {
                            Dom.removeClass(allRows[oArg.rowIndex].cells[oArg.cellIndex],DT.CLASS_SELECTED);
                        }
                        oArg.rowIndex++;
                    },
                    scope: this,
                    iterations:allRows.length,
                    argument: {rowIndex:0,cellIndex:oColumn.getKeyIndex()}
                });

                this._clearTrTemplateEl();

                this._elTbody.style.display = "none";
                this._runRenderChain();
                this._elTbody.style.display = "";

                this.fireEvent("columnUnselectEvent",{column:oColumn});
                YAHOO.log("Column \"" + oColumn.key + "\" unselected", "info", this.toString());
            }
            else {
                YAHOO.log("Could not unselect Column \"" + oColumn.key + "\". Only non-nested Columns can be unselected", "warn", this.toString());
            }
        }
    },

    /**
     * Returns an array selected Column instances.
     *
     * @method getSelectedColumns
     * @return {YAHOO.widget.Column[]} Array of Column instances.
     */
    getSelectedColumns : function(oColumn) {
        var selectedColumns = [];
        var aKeys = this._oColumnSet.keys;
        for(var i=0,len=aKeys.length; i<len; i++) {
            if(aKeys[i].selected) {
                selectedColumns[selectedColumns.length] = aKeys[i];
            }
        }
        return selectedColumns;
    },

    /**
     * Assigns the class YAHOO.widget.DataTable.CLASS_HIGHLIGHTED to cells of the given Column.
     * NOTE: You cannot highlight/unhighlight nested Columns. You can only
     * highlight/unhighlight non-nested Columns, and bottom-level key Columns.
     *
     * @method highlightColumn
     * @param column {HTMLElement | String | Number} DOM reference or ID string to a
     * TH/TD element (or child of a TH/TD element), a Column key, or a ColumnSet key index.
     */
    highlightColumn : function(column) {
        var oColumn = this.getColumn(column);
        // Only bottom-level Columns can get highlighted
        if(oColumn && (oColumn.getKeyIndex() !== null)) {
            // Update head cell
            var elTh = oColumn.getThEl();
            Dom.addClass(elTh,DT.CLASS_HIGHLIGHTED);

            // Update body cells
            var allRows = this.getTbodyEl().rows;
            var oChainRender = this._oChainRender;
            oChainRender.add({
                method: function(oArg) {
                    if((this instanceof DT) && this._sId && allRows[oArg.rowIndex] && allRows[oArg.rowIndex].cells[oArg.cellIndex]) {
                        Dom.addClass(allRows[oArg.rowIndex].cells[oArg.cellIndex],DT.CLASS_HIGHLIGHTED);
                    }
                    oArg.rowIndex++;
                },
                scope: this,
                iterations:allRows.length,
                argument: {rowIndex:0,cellIndex:oColumn.getKeyIndex()},
                timeout: -1
            });
            this._elTbody.style.display = "none";
            this._runRenderChain();
            this._elTbody.style.display = "";

            this.fireEvent("columnHighlightEvent",{column:oColumn});
            YAHOO.log("Column \"" + oColumn.key + "\" highlighed", "info", this.toString());
        }
        else {
            YAHOO.log("Could not highlight Column \"" + oColumn.key + "\". Only non-nested Columns can be highlighted", "warn", this.toString());
        }
    },

    /**
     * Removes the class YAHOO.widget.DataTable.CLASS_HIGHLIGHTED to cells of the given Column.
     * NOTE: You cannot highlight/unhighlight nested Columns. You can only
     * highlight/unhighlight non-nested Columns, and bottom-level key Columns.
     *
     * @method unhighlightColumn
     * @param column {HTMLElement | String | Number} DOM reference or ID string to a
     * TH/TD element (or child of a TH/TD element), a Column key, or a ColumnSet key index.
     */
    unhighlightColumn : function(column) {
        var oColumn = this.getColumn(column);
        // Only bottom-level Columns can get highlighted
        if(oColumn && (oColumn.getKeyIndex() !== null)) {
            // Update head cell
            var elTh = oColumn.getThEl();
            Dom.removeClass(elTh,DT.CLASS_HIGHLIGHTED);

            // Update body cells
            var allRows = this.getTbodyEl().rows;
            var oChainRender = this._oChainRender;
            oChainRender.add({
                method: function(oArg) {
                    if((this instanceof DT) && this._sId && allRows[oArg.rowIndex] && allRows[oArg.rowIndex].cells[oArg.cellIndex]) {
                        Dom.removeClass(allRows[oArg.rowIndex].cells[oArg.cellIndex],DT.CLASS_HIGHLIGHTED);
                    }
                    oArg.rowIndex++;
                },
                scope: this,
                iterations:allRows.length,
                argument: {rowIndex:0,cellIndex:oColumn.getKeyIndex()},
                timeout: -1
            });
            this._elTbody.style.display = "none";
            this._runRenderChain();
            this._elTbody.style.display = "";

            this.fireEvent("columnUnhighlightEvent",{column:oColumn});
            YAHOO.log("Column \"" + oColumn.key + "\" unhighlighted", "info", this.toString());
        }
        else {
            YAHOO.log("Could not unhighlight Column \"" + oColumn.key + "\". Only non-nested Columns can be unhighlighted", "warn", this.toString());
        }
    },

    // ROW FUNCTIONS

    /**
     * Adds one new Record of data into the RecordSet at the index if given,
     * otherwise at the end. If the new Record is in page view, the
     * corresponding DOM elements are also updated.
     *
     * @method addRow
     * @param oData {Object} Object literal of data for the row.
     * @param index {Number} (optional) RecordSet position index at which to add data.
     */
    addRow : function(oData, index) {
        if(lang.isNumber(index) && (index < 0 || index > this._oRecordSet.getLength())) {
            YAHOO.log("Could not add row at index " + index + " with " + lang.dump(oData), "warn", this.toString());
            return;
        }

        if(oData && lang.isObject(oData)) {
            var oRecord = this._oRecordSet.addRecord(oData, index);
            if(oRecord) {
                var recIndex;
                var oPaginator = this.get('paginator');

                // Paginated
                if (oPaginator) {
                    // Update the paginator's totalRecords
                    var totalRecords = oPaginator.get('totalRecords');
                    if (totalRecords !== widget.Paginator.VALUE_UNLIMITED) {
                        oPaginator.set('totalRecords',totalRecords + 1);
                    }

                    recIndex = this.getRecordIndex(oRecord);
                    var endRecIndex = (oPaginator.getPageRecords())[1];

                    // New record affects the view
                    if (recIndex <= endRecIndex) {
                        // Defer UI updates to the render method
                        this.render();
                    }

                    this.fireEvent("rowAddEvent", {record:oRecord});
                    YAHOO.log("Added a row for Record " + YAHOO.lang.dump(oRecord) + " at RecordSet index " + recIndex, "info", this.toString());
                    return;
                }
                // Not paginated
                else {
                    recIndex = this.getRecordIndex(oRecord);
                    if(lang.isNumber(recIndex)) {
                        // Add the TR element
                        this._oChainRender.add({
                            method: function(oArg) {
                                if((this instanceof DT) && this._sId) {
                                    var oRecord = oArg.record;
                                    var recIndex = oArg.recIndex;
                                    var elNewTr = this._addTrEl(oRecord);
                                    if(elNewTr) {
                                        var elNext = (this._elTbody.rows[recIndex]) ? this._elTbody.rows[recIndex] : null;
                                        this._elTbody.insertBefore(elNewTr, elNext);

                                        // Set FIRST/LAST
                                        if(recIndex === 0) {
                                            this._setFirstRow();
                                        }
                                        if(elNext === null) {
                                            this._setLastRow();
                                        }
                                        // Set EVEN/ODD
                                        this._setRowStripes();

                                        this.hideTableMessage();

                                        this.fireEvent("rowAddEvent", {record:oRecord});
                                        YAHOO.log("Added a row for Record " + YAHOO.lang.dump(oRecord) + " at RecordSet index " + recIndex, "info", this.toString());
                                    }
                                }
                            },
                            argument: {record: oRecord, recIndex: recIndex},
                            scope: this,
                            timeout: (this.get("renderLoopSize") > 0) ? 0 : -1
                        });
                        this._runRenderChain();
                        return;
                    }
                }
            }
        }
        YAHOO.log("Could not add row at index " + index + " with " + lang.dump(oData), "warn", this.toString());
    },

    /**
     * Convenience method to add multiple rows.
     *
     * @method addRows
     * @param aData {Object[]} Array of object literal data for the rows.
     * @param index {Number} (optional) RecordSet position index at which to add data.
     */
    addRows : function(aData, index) {
        if(lang.isNumber(index) && (index < 0 || index > this._oRecordSet.getLength())) {
            YAHOO.log("Could not add rows at index " + index + " with " + lang.dump(aData), "warn", this.toString());
            return;
        }

        if(lang.isArray(aData)) {
            var aRecords = this._oRecordSet.addRecords(aData, index);
            if(aRecords) {
                var recIndex = this.getRecordIndex(aRecords[0]);

                // Paginated
                var oPaginator = this.get('paginator');
                if (oPaginator) {
                    // Update the paginator's totalRecords
                    var totalRecords = oPaginator.get('totalRecords');
                    if (totalRecords !== widget.Paginator.VALUE_UNLIMITED) {
                        oPaginator.set('totalRecords',totalRecords + aRecords.length);
                    }

                    var endRecIndex = (oPaginator.getPageRecords())[1];

                    // At least one of the new records affects the view
                    if (recIndex <= endRecIndex) {
                        this.render();
                    }

                    this.fireEvent("rowsAddEvent", {records:aRecords});
                    YAHOO.log("Added " + aRecords.length +
                            " rows at index " + this._oRecordSet.getRecordIndex(aRecords[0]) +
                            " with data " + lang.dump(aData), "info", this.toString());
                    return;
                }
                // Not paginated
                else {
                    // Add the TR elements
                    var loopN = this.get("renderLoopSize");
                    var loopEnd = recIndex + aData.length;
                    var nRowsNeeded = (loopEnd - recIndex); // how many needed
                    var isLast = (recIndex >= this._elTbody.rows.length);
                    this._oChainRender.add({
                        method: function(oArg) {
                            if((this instanceof DT) && this._sId) {
                                var aRecords = oArg.aRecords,
                                    i = oArg.nCurrentRow,
                                    j = oArg.nCurrentRecord,
                                    len = loopN > 0 ? Math.min(i + loopN,loopEnd) : loopEnd,
                                    df = document.createDocumentFragment(),
                                    elNext = (this._elTbody.rows[i]) ? this._elTbody.rows[i] : null;
                                for(; i < len; i++, j++) {
                                    df.appendChild(this._addTrEl(aRecords[j]));
                                }
                                this._elTbody.insertBefore(df, elNext);
                                oArg.nCurrentRow = i;
                                oArg.nCurrentRecord = j;
                            }
                        },
                        iterations: (loopN > 0) ? Math.ceil(loopEnd/loopN) : 1,
                        argument: {nCurrentRow:recIndex,nCurrentRecord:0,aRecords:aRecords},
                        scope: this,
                        timeout: (loopN > 0) ? 0 : -1
                    });
                    this._oChainRender.add({
                        method: function(oArg) {
                            var recIndex = oArg.recIndex;
                            // Set FIRST/LAST
                            if(recIndex === 0) {
                                this._setFirstRow();
                            }
                            if(oArg.isLast) {
                                this._setLastRow();
                            }
                            // Set EVEN/ODD
                            this._setRowStripes();

                            this.fireEvent("rowsAddEvent", {records:aRecords});
                            YAHOO.log("Added " + aRecords.length +
                                    " rows at index " + this._oRecordSet.getRecordIndex(aRecords[0]) +
                                    " with data " + lang.dump(aData), "info", this.toString());
                        },
                        argument: {recIndex: recIndex, isLast: isLast},
                        scope: this,
                        timeout: -1 // Needs to run immediately after the DOM insertions above
                    });
                    this._runRenderChain();
                    this.hideTableMessage();
                    return;
                }
            }
        }
        YAHOO.log("Could not add rows at index " + index + " with " + lang.dump(aData), "warn", this.toString());
    },

    /**
     * For the given row, updates the associated Record with the given data. If the
     * row is on current page, the corresponding DOM elements are also updated.
     *
     * @method updateRow
     * @param row {YAHOO.widget.Record | Number | HTMLElement | String}
     * Which row to update: By Record instance, by Record's RecordSet
     * position index, by HTMLElement reference to the TR element, or by ID string
     * of the TR element.
     * @param oData {Object} Object literal of data for the row.
     */
    updateRow : function(row, oData) {
        var index = row;
        if (!lang.isNumber(index)) {
            index = this.getRecordIndex(row);
        }

        // Update the Record
        if(lang.isNumber(index) && (index >= 0)) {
            var oRecordSet = this._oRecordSet,
                oldRecord = oRecordSet.getRecord(index);

            if(oldRecord) {
                var updatedRecord = this._oRecordSet.setRecord(oData, index),
                    elRow = this.getTrEl(oldRecord),
                    // Copy data from the Record for the event that gets fired later
                    oldData = oldRecord ? oldRecord.getData() : null;

                if(updatedRecord) {
                    // Update selected rows as necessary
                    var tracker = this._aSelections || [],
                    i=0,
                    oldId = oldRecord.getId(),
                    newId = updatedRecord.getId();
                    for(; i<tracker.length; i++) {
                        if((tracker[i] === oldId)) {
                            tracker[i] = newId;
                        }
                        else if(tracker[i].recordId === oldId) {
                            tracker[i].recordId = newId;
                        }
                    }

                    // Update anchors as necessary
                    if(this._oAnchorRecord && this._oAnchorRecord.getId() === oldId) {
                        this._oAnchorRecord = updatedRecord;
                    }
                    if(this._oAnchorCell && this._oAnchorCell.record.getId() === oldId) {
                        this._oAnchorCell.record = updatedRecord;
                    }

                    // Update the TR only if row is on current page
                    this._oChainRender.add({
                        method: function() {
                            if((this instanceof DT) && this._sId) {
                                // Paginated
                                var oPaginator = this.get('paginator');
                                if (oPaginator) {
                                    var pageStartIndex = (oPaginator.getPageRecords())[0],
                                        pageLastIndex = (oPaginator.getPageRecords())[1];

                                    // At least one of the new records affects the view
                                    if ((index >= pageStartIndex) || (index <= pageLastIndex)) {
                                        this.render();
                                    }
                                }
                                else {
                                    if(elRow) {
                                        this._updateTrEl(elRow, updatedRecord);
                                    }
                                    else {
                                        this.getTbodyEl().appendChild(this._addTrEl(updatedRecord));
                                    }
                                }
                                this.fireEvent("rowUpdateEvent", {record:updatedRecord, oldData:oldData});
                                YAHOO.log("DataTable row updated: Record ID = " + updatedRecord.getId() +
                                        ", Record index = " + this.getRecordIndex(updatedRecord) +
                                        ", page row index = " + this.getTrIndex(updatedRecord), "info", this.toString());
                            }
                        },
                        scope: this,
                        timeout: (this.get("renderLoopSize") > 0) ? 0 : -1
                    });
                    this._runRenderChain();
                    return;
                }
            }
        }
        YAHOO.log("Could not update row " + row + " with the data : " + lang.dump(oData), "warn", this.toString());
        return;
    },

    /**
     * Starting with the given row, updates associated Records with the given data.
     * The number of rows to update are determined by the array of data provided.
     * Undefined data (i.e., not an object literal) causes a row to be skipped. If
     * any of the rows are on current page, the corresponding DOM elements are also
     * updated.
     *
     * @method updateRows
     * @param startrow {YAHOO.widget.Record | Number | HTMLElement | String}
     * Starting row to update: By Record instance, by Record's RecordSet
     * position index, by HTMLElement reference to the TR element, or by ID string
     * of the TR element.
     * @param aData {Object[]} Array of object literal of data for the rows.
     */
    updateRows : function(startrow, aData) {
        if(lang.isArray(aData)) {
            var startIndex = startrow,
                oRecordSet = this._oRecordSet,
                lastRowIndex = oRecordSet.getLength();

            if (!lang.isNumber(startrow)) {
                startIndex = this.getRecordIndex(startrow);
            }

            if(lang.isNumber(startIndex) && (startIndex >= 0) && (startIndex < oRecordSet.getLength())) {
                var lastIndex = startIndex + aData.length,
                    aOldRecords = oRecordSet.getRecords(startIndex, aData.length),
                    aNewRecords = oRecordSet.setRecords(aData, startIndex);
                if(aNewRecords) {
                    var tracker = this._aSelections || [],
                        i=0, j, newRecord, newId, oldId,
                        anchorRecord = this._oAnchorRecord ? this._oAnchorRecord.getId() : null,
                        anchorCell = this._oAnchorCell ? this._oAnchorCell.record.getId() : null;
                    for(; i<aOldRecords.length; i++) {
                        oldId = aOldRecords[i].getId();
                        newRecord = aNewRecords[i];
                        newId = newRecord.getId();

                        // Update selected rows as necessary
                        for(j=0; j<tracker.length; j++) {
                            if((tracker[j] === oldId)) {
                                tracker[j] = newId;
                            }
                            else if(tracker[j].recordId === oldId) {
                                tracker[j].recordId = newId;
                            }
                        }

                        // Update anchors as necessary
                        if(anchorRecord && anchorRecord === oldId) {
                            this._oAnchorRecord = newRecord;
                        }
                        if(anchorCell && anchorCell === oldId) {
                            this._oAnchorCell.record = newRecord;
                        }
                   }

                    // Paginated
                    var oPaginator = this.get('paginator');
                    if (oPaginator) {
                        var pageStartIndex = (oPaginator.getPageRecords())[0],
                            pageLastIndex = (oPaginator.getPageRecords())[1];

                        // At least one of the new records affects the view
                        if ((startIndex >= pageStartIndex) || (lastIndex <= pageLastIndex)) {
                            this.render();
                        }

                        this.fireEvent("rowsAddEvent", {newRecords:aNewRecords, oldRecords:aOldRecords});
                        YAHOO.log("Added " + aNewRecords.length +
                                " rows starting at index " + startIndex +
                                " with data " + lang.dump(aData), "info", this.toString());
                        return;
                    }
                    // Not paginated
                    else {
                        // Update the TR elements
                        var loopN = this.get("renderLoopSize"),
                            rowCount = aData.length, // how many needed
                            isLast = (lastIndex >= lastRowIndex),
                            isAdding = (lastIndex > lastRowIndex);

                        this._oChainRender.add({
                            method: function(oArg) {
                                if((this instanceof DT) && this._sId) {
                                    var aRecords = oArg.aRecords,
                                        i = oArg.nCurrentRow,
                                        j = oArg.nDataPointer,
                                        len = loopN > 0 ? Math.min(i+loopN, startIndex+aRecords.length) : startIndex+aRecords.length;

                                    for(; i < len; i++,j++) {
                                        if(isAdding && (i>=lastRowIndex)) {
                                            this._elTbody.appendChild(this._addTrEl(aRecords[j]));
                                        }
                                        else {
                                            this._updateTrEl(this._elTbody.rows[i], aRecords[j]);
                                        }
                                    }
                                    oArg.nCurrentRow = i;
                                    oArg.nDataPointer = j;
                                }
                            },
                            iterations: (loopN > 0) ? Math.ceil(rowCount/loopN) : 1,
                            argument: {nCurrentRow:startIndex,aRecords:aNewRecords,nDataPointer:0,isAdding:isAdding},
                            scope: this,
                            timeout: (loopN > 0) ? 0 : -1
                        });
                        this._oChainRender.add({
                            method: function(oArg) {
                                var recIndex = oArg.recIndex;
                                // Set FIRST/LAST
                                if(recIndex === 0) {
                                    this._setFirstRow();
                                }
                                if(oArg.isLast) {
                                    this._setLastRow();
                                }
                                // Set EVEN/ODD
                                this._setRowStripes();

                                this.fireEvent("rowsAddEvent", {newRecords:aNewRecords, oldRecords:aOldRecords});
                                YAHOO.log("Added " + aNewRecords.length +
                                        " rows starting at index " + startIndex +
                                        " with data " + lang.dump(aData), "info", this.toString());
                            },
                            argument: {recIndex: startIndex, isLast: isLast},
                            scope: this,
                            timeout: -1 // Needs to run immediately after the DOM insertions above
                        });
                        this._runRenderChain();
                        this.hideTableMessage();
                        return;
                    }
                }
            }
        }
        YAHOO.log("Could not update rows at " + startrow + " with " + lang.dump(aData), "warn", this.toString());
    },

    /**
     * Deletes the given row's Record from the RecordSet. If the row is on current page,
     * the corresponding DOM elements are also deleted.
     *
     * @method deleteRow
     * @param row {HTMLElement | String | Number} DOM element reference or ID string
     * to DataTable page element or RecordSet index.
     */
    deleteRow : function(row) {
        var nRecordIndex = (lang.isNumber(row)) ? row : this.getRecordIndex(row);
        if(lang.isNumber(nRecordIndex)) {
            var oRecord = this.getRecord(nRecordIndex);
            if(oRecord) {
                var nTrIndex = this.getTrIndex(nRecordIndex);

                // Remove from selection tracker if there
                var sRecordId = oRecord.getId();
                var tracker = this._aSelections || [];
                for(var j=tracker.length-1; j>-1; j--) {
                    if((lang.isString(tracker[j]) && (tracker[j] === sRecordId)) ||
                            (lang.isObject(tracker[j]) && (tracker[j].recordId === sRecordId))) {
                        tracker.splice(j,1);
                    }
                }

                // Delete Record from RecordSet
                var oData = this._oRecordSet.deleteRecord(nRecordIndex);

                // Update the UI
                if(oData) {
                    // If paginated and the deleted row was on this or a prior page, just
                    // re-render
                    var oPaginator = this.get('paginator');
                    if (oPaginator) {
                        // Update the paginator's totalRecords
                        var totalRecords = oPaginator.get('totalRecords'),
                            // must capture before the totalRecords change because
                            // Paginator shifts to previous page automatically
                            rng = oPaginator.getPageRecords();

                        if (totalRecords !== widget.Paginator.VALUE_UNLIMITED) {
                            oPaginator.set('totalRecords',totalRecords - 1);
                        }

                        // The deleted record was on this or a prior page, re-render
                        if (!rng || nRecordIndex <= rng[1]) {
                            this.render();
                        }

                        this._oChainRender.add({
                            method: function() {
                                if((this instanceof DT) && this._sId) {
                                    this.fireEvent("rowDeleteEvent", {recordIndex:nRecordIndex, oldData:oData, trElIndex:nTrIndex});
                                    YAHOO.log("Deleted row with data " + YAHOO.lang.dump(oData) + " at RecordSet index " + nRecordIndex + " and page row index " + nTrIndex, "info", this.toString());
                                }
                            },
                            scope: this,
                            timeout: (this.get("renderLoopSize") > 0) ? 0 : -1
                        });
                        this._runRenderChain();
                    }
                    // Not paginated
                    else {
                        if(lang.isNumber(nTrIndex)) {
                            this._oChainRender.add({
                                method: function() {
                                    if((this instanceof DT) && this._sId) {
                                        var isLast = (nRecordIndex === this._oRecordSet.getLength());//(nTrIndex == this.getLastTrEl().sectionRowIndex);
                                        this._deleteTrEl(nTrIndex);

                                        // Post-delete tasks
                                        if(this._elTbody.rows.length > 0) {
                                            // Set FIRST/LAST
                                            if(nTrIndex === 0) {
                                                this._setFirstRow();
                                            }
                                            if(isLast) {
                                                this._setLastRow();
                                            }
                                            // Set EVEN/ODD
                                            if(nTrIndex != this._elTbody.rows.length) {
                                                this._setRowStripes(nTrIndex);
                                            }
                                        }

                                        this.fireEvent("rowDeleteEvent", {recordIndex:nRecordIndex,oldData:oData, trElIndex:nTrIndex});
                                        YAHOO.log("Deleted row with data " + YAHOO.lang.dump(oData) + " at RecordSet index " + nRecordIndex + " and page row index " + nTrIndex, "info", this.toString());
                                    }
                                },
                                scope: this,
                                timeout: (this.get("renderLoopSize") > 0) ? 0 : -1
                            });
                            this._runRenderChain();
                            return;
                        }
                    }
                }
            }
        }
        YAHOO.log("Could not delete row: " + row, "warn", this.toString());
        return null;
    },

    /**
     * Convenience method to delete multiple rows.
     *
     * @method deleteRows
     * @param row {HTMLElement | String | Number} DOM element reference or ID string
     * to DataTable page element or RecordSet index.
     * @param count {Number} (optional) How many rows to delete. A negative value
     * will delete towards the beginning.
     */
    deleteRows : function(row, count) {
        var nRecordIndex = (lang.isNumber(row)) ? row : this.getRecordIndex(row);
        if(lang.isNumber(nRecordIndex)) {
            var oRecord = this.getRecord(nRecordIndex);
            if(oRecord) {
                var nTrIndex = this.getTrIndex(nRecordIndex);

                // Remove from selection tracker if there
                var sRecordId = oRecord.getId();
                var tracker = this._aSelections || [];
                for(var j=tracker.length-1; j>-1; j--) {
                    if((lang.isString(tracker[j]) && (tracker[j] === sRecordId)) ||
                            (lang.isObject(tracker[j]) && (tracker[j].recordId === sRecordId))) {
                        tracker.splice(j,1);
                    }
                }

                // Delete Record from RecordSet
                var highIndex = nRecordIndex;
                var lowIndex = nRecordIndex;

                // Validate count and account for negative value
                if(count && lang.isNumber(count)) {
                    highIndex = (count > 0) ? nRecordIndex + count -1 : nRecordIndex;
                    lowIndex = (count > 0) ? nRecordIndex : nRecordIndex + count + 1;
                    count = (count > 0) ? count : count*-1;
                    if(lowIndex < 0) {
                        lowIndex = 0;
                        count = highIndex - lowIndex + 1;
                    }
                }
                else {
                    count = 1;
                }

                var aData = this._oRecordSet.deleteRecords(lowIndex, count);

                // Update the UI
                if(aData) {
                    var oPaginator = this.get('paginator'),
                        loopN = this.get("renderLoopSize");
                    // If paginated and the deleted row was on this or a prior page, just
                    // re-render
                    if (oPaginator) {
                        // Update the paginator's totalRecords
                        var totalRecords = oPaginator.get('totalRecords'),
                            // must capture before the totalRecords change because
                            // Paginator shifts to previous page automatically
                            rng = oPaginator.getPageRecords();

                        if (totalRecords !== widget.Paginator.VALUE_UNLIMITED) {
                            oPaginator.set('totalRecords',totalRecords - aData.length);
                        }

                        // The records were on this or a prior page, re-render
                        if (!rng || lowIndex <= rng[1]) {
                            this.render();
                        }

                        this._oChainRender.add({
                            method: function(oArg) {
                                if((this instanceof DT) && this._sId) {
                                    this.fireEvent("rowsDeleteEvent", {recordIndex:lowIndex, oldData:aData, count:count});
                                    YAHOO.log("DataTable " + count + " rows deleted starting at index " + lowIndex, "info", this.toString());
                                }
                            },
                            scope: this,
                            timeout: (loopN > 0) ? 0 : -1
                        });
                        this._runRenderChain();
                        return;
                    }
                    // Not paginated
                    else {
                        if(lang.isNumber(nTrIndex)) {
                            // Delete the TR elements starting with highest index
                            var loopEnd = lowIndex;
                            var nRowsNeeded = count; // how many needed
                            this._oChainRender.add({
                                method: function(oArg) {
                                    if((this instanceof DT) && this._sId) {
                                        var i = oArg.nCurrentRow,
                                            len = (loopN > 0) ? (Math.max(i - loopN,loopEnd)-1) : loopEnd-1;
                                        for(; i>len; --i) {
                                            this._deleteTrEl(i);
                                        }
                                        oArg.nCurrentRow = i;
                                    }
                                },
                                iterations: (loopN > 0) ? Math.ceil(count/loopN) : 1,
                                argument: {nCurrentRow:highIndex},
                                scope: this,
                                timeout: (loopN > 0) ? 0 : -1
                            });
                            this._oChainRender.add({
                                method: function() {
                                    // Post-delete tasks
                                    if(this._elTbody.rows.length > 0) {
                                        this._setFirstRow();
                                        this._setLastRow();
                                        this._setRowStripes();
                                    }

                                    this.fireEvent("rowsDeleteEvent", {recordIndex:lowIndex, oldData:aData, count:count});
                                    YAHOO.log("DataTable " + count + " rows deleted starting at index " + lowIndex, "info", this.toString());
                                },
                                scope: this,
                                timeout: -1 // Needs to run immediately after the DOM deletions above
                            });
                            this._runRenderChain();
                            return;
                        }
                    }
                }
            }
        }
        YAHOO.log("Could not delete " + count + " rows at row " + row, "warn", this.toString());
        return null;
    },

    // CELL FUNCTIONS

    /**
     * Outputs markup into the given TD based on given Record.
     *
     * @method formatCell
     * @param elLiner {HTMLElement} The liner DIV element within the TD.
     * @param oRecord {YAHOO.widget.Record} (Optional) Record instance.
     * @param oColumn {YAHOO.widget.Column} (Optional) Column instance.
     */
    formatCell : function(elLiner, oRecord, oColumn) {
        if(!oRecord) {
            oRecord = this.getRecord(elLiner);
        }
        if(!oColumn) {
            oColumn = this.getColumn(this.getCellIndex(elLiner.parentNode));
        }

        if(oRecord && oColumn) {
            var sField = oColumn.field;
            var oData = oRecord.getData(sField);

            var fnFormatter = typeof oColumn.formatter === 'function' ?
                              oColumn.formatter :
                              DT.Formatter[oColumn.formatter+''] ||
                              DT.Formatter.defaultFormatter;

            // Apply special formatter
            if(fnFormatter) {
                fnFormatter.call(this, elLiner, oRecord, oColumn, oData);
            }
            else {
                elLiner.innerHTML = oData;
            }

            this.fireEvent("cellFormatEvent", {record:oRecord, column:oColumn, key:oColumn.key, el:elLiner});
        }
        else {
            YAHOO.log("Could not format cell " + elLiner, "error", this.toString());
        }
    },

    /**
     * For the given row and column, updates the Record with the given data. If the
     * cell is on current page, the corresponding DOM elements are also updated.
     *
     * @method updateCell
     * @param oRecord {YAHOO.widget.Record} Record instance.
     * @param oColumn {YAHOO.widget.Column | String | Number} A Column key, or a ColumnSet key index.
     * @param oData {Object} New data value for the cell.
     * @param skipRender {Boolean} Skips render step. Editors that update multiple
     * cells in ScrollingDataTable should render only on the last call to updateCell().
     */
    updateCell : function(oRecord, oColumn, oData, skipRender) {
        // Validate Column and Record
        oColumn = (oColumn instanceof YAHOO.widget.Column) ? oColumn : this.getColumn(oColumn);
        if(oColumn && oColumn.getField() && (oRecord instanceof YAHOO.widget.Record)) {
            var sKey = oColumn.getField(),

            // Copy data from the Record for the event that gets fired later
            //var oldData = YAHOO.widget.DataTable._cloneObject(oRecord.getData());
                oldData = oRecord.getData(sKey);

            // Update Record with new data
            this._oRecordSet.updateRecordValue(oRecord, sKey, oData);

            // Update the TD only if row is on current page
            var elTd = this.getTdEl({record: oRecord, column: oColumn});
            if(elTd) {
                this._oChainRender.add({
                    method: function() {
                        if((this instanceof DT) && this._sId) {
                            this.formatCell(elTd.firstChild, oRecord, oColumn);
                            this.fireEvent("cellUpdateEvent", {record:oRecord, column: oColumn, oldData:oldData});
                            YAHOO.log("DataTable cell updated: Record ID = " + oRecord.getId() +
                                    ", Record index = " + this.getRecordIndex(oRecord) +
                                    ", page row index = " + this.getTrIndex(oRecord) +
                                    ", Column key = " + oColumn.getKey(), "info", this.toString());
                        }
                    },
                    scope: this,
                    timeout: (this.get("renderLoopSize") > 0) ? 0 : -1
                });
                // Bug 2529024
                if(!skipRender) {
                    this._runRenderChain();
                }
            }
            else {
                this.fireEvent("cellUpdateEvent", {record:oRecord, column: oColumn, oldData:oldData});
                YAHOO.log("DataTable cell updated: Record ID = " + oRecord.getId() +
                        ", Record index = " + this.getRecordIndex(oRecord) +
                        ", page row index = " + this.getTrIndex(oRecord) +
                        ", Column key = " + oColumn.getKey(), "info", this.toString());
            }
        }
    },

    // PAGINATION
    /**
     * Method executed during set() operation for the "paginator" attribute.
     * Adds and/or severs event listeners between DataTable and Paginator
     *
     * @method _updatePaginator
     * @param newPag {Paginator} Paginator instance (or null) for DataTable to use
     * @private
     */
    _updatePaginator : function (newPag) {
        var oldPag = this.get('paginator');
        if (oldPag && newPag !== oldPag) {
            oldPag.unsubscribe('changeRequest', this.onPaginatorChangeRequest, this, true);
        }
        if (newPag) {
            newPag.subscribe('changeRequest', this.onPaginatorChangeRequest, this, true);
        }
    },

    /**
     * Update the UI infrastructure in response to a "paginator" attribute change.
     *
     * @method _handlePaginatorChange
     * @param e {Object} Change event object containing keys 'type','newValue',
     *                   and 'prevValue'
     * @private
     */
    _handlePaginatorChange : function (e) {
        if (e.prevValue === e.newValue) { return; }

        var newPag     = e.newValue,
            oldPag     = e.prevValue,
            containers = this._defaultPaginatorContainers();

        if (oldPag) {
            if (oldPag.getContainerNodes()[0] == containers[0]) {
                oldPag.set('containers',[]);
            }
            oldPag.destroy();

            // Convenience: share the default containers if possible.
            // Otherwise, remove the default containers from the DOM.
            if (containers[0]) {
                if (newPag && !newPag.getContainerNodes().length) {
                    newPag.set('containers',containers);
                } else {
                    // No new Paginator to use existing containers, OR new
                    // Paginator has configured containers.
                    for (var i = containers.length - 1; i >= 0; --i) {
                        if (containers[i]) {
                            containers[i].parentNode.removeChild(containers[i]);
                        }
                    }
                }
            }
        }

        if (!this._bInit) {
            this.render();

        }

        if (newPag) {
            this.renderPaginator();
        }

    },

    /**
     * Returns the default containers used for Paginators.  If create param is
     * passed, the containers will be created and added to the DataTable container.
     *
     * @method _defaultPaginatorContainers
     * @param create {boolean} Create the default containers if not found
     * @private
     */
    _defaultPaginatorContainers : function (create) {
        var above_id = this._sId + '-paginator0',
            below_id = this._sId + '-paginator1',
            above    = Dom.get(above_id),
            below    = Dom.get(below_id);

        if (create && (!above || !below)) {
            // One above and one below the table
            if (!above) {
                above    = document.createElement('div');
                above.id = above_id;
                Dom.addClass(above, DT.CLASS_PAGINATOR);

                this._elContainer.insertBefore(above,this._elContainer.firstChild);
            }

            if (!below) {
                below    = document.createElement('div');
                below.id = below_id;
                Dom.addClass(below, DT.CLASS_PAGINATOR);

                this._elContainer.appendChild(below);
            }
        }

        return [above,below];
    },

    /**
     * Calls Paginator's destroy() method
     *
     * @method _destroyPaginator
     * @private
     */
    _destroyPaginator : function () {
        var oldPag = this.get('paginator');
        if (oldPag) {
            oldPag.destroy();
        }
    },

    /**
     * Renders the Paginator to the DataTable UI
     *
     * @method renderPaginator
     */
    renderPaginator : function () {
        var pag = this.get("paginator");
        if (!pag) { return; }

        // Add the containers if the Paginator is not configured with containers
        if (!pag.getContainerNodes().length) {
            pag.set('containers',this._defaultPaginatorContainers(true));
        }

        pag.render();
    },

    /**
     * Overridable method gives implementers a hook to show loading message before
     * changing Paginator value.
     *
     * @method doBeforePaginatorChange
     * @param oPaginatorState {Object} An object literal describing the proposed pagination state.
     * @return {Boolean} Return true to continue changing Paginator value.
     */
    doBeforePaginatorChange : function(oPaginatorState) {
        this.showTableMessage(this.get("MSG_LOADING"), DT.CLASS_LOADING);
        return true;
    },

    /**
     * Responds to new Pagination states. By default, updates the UI to reflect the
     * new state. If "dynamicData" is true, current selections are purged before
     * a request is sent to the DataSource for data for the new state (using the
     * request returned by "generateRequest()").
     *
     * @method onPaginatorChangeRequest
     * @param oPaginatorState {Object} An object literal describing the proposed pagination state.
     */
    onPaginatorChangeRequest : function (oPaginatorState) {
        var ok = this.doBeforePaginatorChange(oPaginatorState);
        if(ok) {
            // Server-side pagination
            if(this.get("dynamicData")) {
                // Get the current state
                var oState = this.getState();

                // Update pagination values
                oState.pagination = oPaginatorState;

                // Get the request for the new state
                var request = this.get("generateRequest")(oState, this);

                // Purge selections
                this.unselectAllRows();
                this.unselectAllCells();

                // Get the new data from the server
                var callback = {
                    success : this.onDataReturnSetRows,
                    failure : this.onDataReturnSetRows,
                    argument : oState, // Pass along the new state to the callback
                    scope : this
                };
                this._oDataSource.sendRequest(request, callback);
            }
            // Client-side pagination
            else {
                // Set the core pagination values silently (the second param)
                // to avoid looping back through the changeRequest mechanism
                oPaginatorState.paginator.setStartIndex(oPaginatorState.recordOffset,true);
                oPaginatorState.paginator.setRowsPerPage(oPaginatorState.rowsPerPage,true);

                // Update the UI
                this.render();
            }
        }
        else {
            YAHOO.log("Could not change Paginator value \"" + oPaginatorState + "\"", "warn", this.toString());
        }
    },

    // SELECTION/HIGHLIGHTING

    /*
     * Reference to last highlighted cell element
     *
     * @property _elLastHighlightedTd
     * @type HTMLElement
     * @private
     */
    _elLastHighlightedTd : null,

    /*
     * ID string of last highlighted row element
     *
     * @property _sLastHighlightedTrElId
     * @type String
     * @private
     */
    //_sLastHighlightedTrElId : null,

    /**
     * Array to track row selections (by sRecordId) and/or cell selections
     * (by {recordId:sRecordId, columnKey:sColumnKey})
     *
     * @property _aSelections
     * @type Object[]
     * @private
     */
    _aSelections : null,

    /**
     * Record instance of the row selection anchor.
     *
     * @property _oAnchorRecord
     * @type YAHOO.widget.Record
     * @private
     */
    _oAnchorRecord : null,

    /**
     * Object literal representing cell selection anchor:
     * {recordId:sRecordId, columnKey:sColumnKey}.
     *
     * @property _oAnchorCell
     * @type Object
     * @private
     */
    _oAnchorCell : null,

    /**
     * Convenience method to remove the class YAHOO.widget.DataTable.CLASS_SELECTED
     * from all TR elements on the page.
     *
     * @method _unselectAllTrEls
     * @private
     */
    _unselectAllTrEls : function() {
        var selectedRows = Dom.getElementsByClassName(DT.CLASS_SELECTED,"tr",this._elTbody);
        Dom.removeClass(selectedRows, DT.CLASS_SELECTED);
    },

    /**
     * Returns object literal of values that represent the selection trigger. Used
     * to determine selection behavior resulting from a key event.
     *
     * @method _getSelectionTrigger
     * @private
     */
    _getSelectionTrigger : function() {
        var sMode = this.get("selectionMode");
        var oTrigger = {};
        var oTriggerCell, oTriggerRecord, nTriggerRecordIndex, elTriggerRow, nTriggerTrIndex;

        // Cell mode
        if((sMode == "cellblock") || (sMode == "cellrange") || (sMode == "singlecell")) {
            oTriggerCell = this.getLastSelectedCell();
            // No selected cells found
            if(!oTriggerCell) {
                return null;
            }
            else {
                oTriggerRecord = this.getRecord(oTriggerCell.recordId);
                nTriggerRecordIndex = this.getRecordIndex(oTriggerRecord);
                elTriggerRow = this.getTrEl(oTriggerRecord);
                nTriggerTrIndex = this.getTrIndex(elTriggerRow);

                // Selected cell not found on this page
                if(nTriggerTrIndex === null) {
                    return null;
                }
                else {
                    oTrigger.record = oTriggerRecord;
                    oTrigger.recordIndex = nTriggerRecordIndex;
                    oTrigger.el = this.getTdEl(oTriggerCell);
                    oTrigger.trIndex = nTriggerTrIndex;
                    oTrigger.column = this.getColumn(oTriggerCell.columnKey);
                    oTrigger.colKeyIndex = oTrigger.column.getKeyIndex();
                    oTrigger.cell = oTriggerCell;
                    return oTrigger;
                }
            }
        }
        // Row mode
        else {
            oTriggerRecord = this.getLastSelectedRecord();
            // No selected rows found
            if(!oTriggerRecord) {
                    return null;
            }
            else {
                // Selected row found, but is it on current page?
                oTriggerRecord = this.getRecord(oTriggerRecord);
                nTriggerRecordIndex = this.getRecordIndex(oTriggerRecord);
                elTriggerRow = this.getTrEl(oTriggerRecord);
                nTriggerTrIndex = this.getTrIndex(elTriggerRow);

                // Selected row not found on this page
                if(nTriggerTrIndex === null) {
                    return null;
                }
                else {
                    oTrigger.record = oTriggerRecord;
                    oTrigger.recordIndex = nTriggerRecordIndex;
                    oTrigger.el = elTriggerRow;
                    oTrigger.trIndex = nTriggerTrIndex;
                    return oTrigger;
                }
            }
        }
    },

    /**
     * Returns object literal of values that represent the selection anchor. Used
     * to determine selection behavior resulting from a user event.
     *
     * @method _getSelectionAnchor
     * @param oTrigger {Object} (Optional) Object literal of selection trigger values
     * (for key events).
     * @private
     */
    _getSelectionAnchor : function(oTrigger) {
        var sMode = this.get("selectionMode");
        var oAnchor = {};
        var oAnchorRecord, nAnchorRecordIndex, nAnchorTrIndex;

        // Cell mode
        if((sMode == "cellblock") || (sMode == "cellrange") || (sMode == "singlecell")) {
            // Validate anchor cell
            var oAnchorCell = this._oAnchorCell;
            if(!oAnchorCell) {
                if(oTrigger) {
                    oAnchorCell = this._oAnchorCell = oTrigger.cell;
                }
                else {
                    return null;
                }
            }
            oAnchorRecord = this._oAnchorCell.record;
            nAnchorRecordIndex = this._oRecordSet.getRecordIndex(oAnchorRecord);
            nAnchorTrIndex = this.getTrIndex(oAnchorRecord);
            // If anchor cell is not on this page...
            if(nAnchorTrIndex === null) {
                // ...set TR index equal to top TR
                if(nAnchorRecordIndex < this.getRecordIndex(this.getFirstTrEl())) {
                    nAnchorTrIndex = 0;
                }
                // ...set TR index equal to bottom TR
                else {
                    nAnchorTrIndex = this.getRecordIndex(this.getLastTrEl());
                }
            }

            oAnchor.record = oAnchorRecord;
            oAnchor.recordIndex = nAnchorRecordIndex;
            oAnchor.trIndex = nAnchorTrIndex;
            oAnchor.column = this._oAnchorCell.column;
            oAnchor.colKeyIndex = oAnchor.column.getKeyIndex();
            oAnchor.cell = oAnchorCell;
            return oAnchor;
        }
        // Row mode
        else {
            oAnchorRecord = this._oAnchorRecord;
            if(!oAnchorRecord) {
                if(oTrigger) {
                    oAnchorRecord = this._oAnchorRecord = oTrigger.record;
                }
                else {
                    return null;
                }
            }

            nAnchorRecordIndex = this.getRecordIndex(oAnchorRecord);
            nAnchorTrIndex = this.getTrIndex(oAnchorRecord);
            // If anchor row is not on this page...
            if(nAnchorTrIndex === null) {
                // ...set TR index equal to top TR
                if(nAnchorRecordIndex < this.getRecordIndex(this.getFirstTrEl())) {
                    nAnchorTrIndex = 0;
                }
                // ...set TR index equal to bottom TR
                else {
                    nAnchorTrIndex = this.getRecordIndex(this.getLastTrEl());
                }
            }

            oAnchor.record = oAnchorRecord;
            oAnchor.recordIndex = nAnchorRecordIndex;
            oAnchor.trIndex = nAnchorTrIndex;
            return oAnchor;
        }
    },

    /**
     * Determines selection behavior resulting from a mouse event when selection mode
     * is set to "standard".
     *
     * @method _handleStandardSelectionByMouse
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     * @private
     */
    _handleStandardSelectionByMouse : function(oArgs) {
        var elTarget = oArgs.target;

        // Validate target row
        var elTargetRow = this.getTrEl(elTarget);
        if(elTargetRow) {
            var e = oArgs.event;
            var bSHIFT = e.shiftKey;
            var bCTRL = e.ctrlKey || ((navigator.userAgent.toLowerCase().indexOf("mac") != -1) && e.metaKey);

            var oTargetRecord = this.getRecord(elTargetRow);
            var nTargetRecordIndex = this._oRecordSet.getRecordIndex(oTargetRecord);

            var oAnchor = this._getSelectionAnchor();

            var i;

            // Both SHIFT and CTRL
            if(bSHIFT && bCTRL) {
                // Validate anchor
                if(oAnchor) {
                    if(this.isSelected(oAnchor.record)) {
                        // Select all rows between anchor row and target row, including target row
                        if(oAnchor.recordIndex < nTargetRecordIndex) {
                            for(i=oAnchor.recordIndex+1; i<=nTargetRecordIndex; i++) {
                                if(!this.isSelected(i)) {
                                    this.selectRow(i);
                                }
                            }
                        }
                        // Select all rows between target row and anchor row, including target row
                        else {
                            for(i=oAnchor.recordIndex-1; i>=nTargetRecordIndex; i--) {
                                if(!this.isSelected(i)) {
                                    this.selectRow(i);
                                }
                            }
                        }
                    }
                    else {
                        // Unselect all rows between anchor row and target row
                        if(oAnchor.recordIndex < nTargetRecordIndex) {
                            for(i=oAnchor.recordIndex+1; i<=nTargetRecordIndex-1; i++) {
                                if(this.isSelected(i)) {
                                    this.unselectRow(i);
                                }
                            }
                        }
                        // Unselect all rows between target row and anchor row
                        else {
                            for(i=nTargetRecordIndex+1; i<=oAnchor.recordIndex-1; i++) {
                                if(this.isSelected(i)) {
                                    this.unselectRow(i);
                                }
                            }
                        }
                        // Select the target row
                        this.selectRow(oTargetRecord);
                    }
                }
                // Invalid anchor
                else {
                    // Set anchor
                    this._oAnchorRecord = oTargetRecord;

                    // Toggle selection of target
                    if(this.isSelected(oTargetRecord)) {
                        this.unselectRow(oTargetRecord);
                    }
                    else {
                        this.selectRow(oTargetRecord);
                    }
                }
            }
             // Only SHIFT
            else if(bSHIFT) {
                this.unselectAllRows();

                // Validate anchor
                if(oAnchor) {
                    // Select all rows between anchor row and target row,
                    // including the anchor row and target row
                    if(oAnchor.recordIndex < nTargetRecordIndex) {
                        for(i=oAnchor.recordIndex; i<=nTargetRecordIndex; i++) {
                            this.selectRow(i);
                        }
                    }
                    // Select all rows between target row and anchor row,
                    // including the target row and anchor row
                    else {
                        for(i=oAnchor.recordIndex; i>=nTargetRecordIndex; i--) {
                            this.selectRow(i);
                        }
                    }
                }
                // Invalid anchor
                else {
                    // Set anchor
                    this._oAnchorRecord = oTargetRecord;

                    // Select target row only
                    this.selectRow(oTargetRecord);
                }
            }
            // Only CTRL
            else if(bCTRL) {
                // Set anchor
                this._oAnchorRecord = oTargetRecord;

                // Toggle selection of target
                if(this.isSelected(oTargetRecord)) {
                    this.unselectRow(oTargetRecord);
                }
                else {
                    this.selectRow(oTargetRecord);
                }
            }
            // Neither SHIFT nor CTRL
            else {
                this._handleSingleSelectionByMouse(oArgs);
                return;
            }
        }
    },

    /**
     * Determines selection behavior resulting from a key event when selection mode
     * is set to "standard".
     *
     * @method _handleStandardSelectionByKey
     * @param e {HTMLEvent} Event object.
     * @private
     */
    _handleStandardSelectionByKey : function(e) {
        var nKey = Ev.getCharCode(e);

        if((nKey == 38) || (nKey == 40)) {
            var bSHIFT = e.shiftKey;

            // Validate trigger
            var oTrigger = this._getSelectionTrigger();
            // Arrow selection only works if last selected row is on current page
            if(!oTrigger) {
                return null;
            }

            Ev.stopEvent(e);

            // Validate anchor
            var oAnchor = this._getSelectionAnchor(oTrigger);

            // Determine which direction we're going to
            if(bSHIFT) {
                // Selecting down away from anchor row
                if((nKey == 40) && (oAnchor.recordIndex <= oTrigger.trIndex)) {
                    this.selectRow(this.getNextTrEl(oTrigger.el));
                }
                // Selecting up away from anchor row
                else if((nKey == 38) && (oAnchor.recordIndex >= oTrigger.trIndex)) {
                    this.selectRow(this.getPreviousTrEl(oTrigger.el));
                }
                // Unselect trigger
                else {
                    this.unselectRow(oTrigger.el);
                }
            }
            else {
                this._handleSingleSelectionByKey(e);
            }
        }
    },

    /**
     * Determines selection behavior resulting from a mouse event when selection mode
     * is set to "single".
     *
     * @method _handleSingleSelectionByMouse
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     * @private
     */
    _handleSingleSelectionByMouse : function(oArgs) {
        var elTarget = oArgs.target;

        // Validate target row
        var elTargetRow = this.getTrEl(elTarget);
        if(elTargetRow) {
            var oTargetRecord = this.getRecord(elTargetRow);

            // Set anchor
            this._oAnchorRecord = oTargetRecord;

            // Select only target
            this.unselectAllRows();
            this.selectRow(oTargetRecord);
        }
    },

    /**
     * Determines selection behavior resulting from a key event when selection mode
     * is set to "single".
     *
     * @method _handleSingleSelectionByKey
     * @param e {HTMLEvent} Event object.
     * @private
     */
    _handleSingleSelectionByKey : function(e) {
        var nKey = Ev.getCharCode(e);

        if((nKey == 38) || (nKey == 40)) {
            // Validate trigger
            var oTrigger = this._getSelectionTrigger();
            // Arrow selection only works if last selected row is on current page
            if(!oTrigger) {
                return null;
            }

            Ev.stopEvent(e);

            // Determine the new row to select
            var elNew;
            if(nKey == 38) { // arrow up
                elNew = this.getPreviousTrEl(oTrigger.el);

                // Validate new row
                if(elNew === null) {
                    //TODO: wrap around to last tr on current page
                    //elNew = this.getLastTrEl();

                    //TODO: wrap back to last tr of previous page

                    // Top row selection is sticky
                    elNew = this.getFirstTrEl();
                }
            }
            else if(nKey == 40) { // arrow down
                elNew = this.getNextTrEl(oTrigger.el);

                // Validate new row
                if(elNew === null) {
                    //TODO: wrap around to first tr on current page
                    //elNew = this.getFirstTrEl();

                    //TODO: wrap forward to first tr of previous page

                    // Bottom row selection is sticky
                    elNew = this.getLastTrEl();
                }
            }

            // Unselect all rows
            this.unselectAllRows();

            // Select the new row
            this.selectRow(elNew);

            // Set new anchor
            this._oAnchorRecord = this.getRecord(elNew);
        }
    },

    /**
     * Determines selection behavior resulting from a mouse event when selection mode
     * is set to "cellblock".
     *
     * @method _handleCellBlockSelectionByMouse
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     * @private
     */
    _handleCellBlockSelectionByMouse : function(oArgs) {
        var elTarget = oArgs.target;

        // Validate target cell
        var elTargetCell = this.getTdEl(elTarget);
        if(elTargetCell) {
            var e = oArgs.event;
            var bSHIFT = e.shiftKey;
            var bCTRL = e.ctrlKey || ((navigator.userAgent.toLowerCase().indexOf("mac") != -1) && e.metaKey);

            var elTargetRow = this.getTrEl(elTargetCell);
            var nTargetTrIndex = this.getTrIndex(elTargetRow);
            var oTargetColumn = this.getColumn(elTargetCell);
            var nTargetColKeyIndex = oTargetColumn.getKeyIndex();
            var oTargetRecord = this.getRecord(elTargetRow);
            var nTargetRecordIndex = this._oRecordSet.getRecordIndex(oTargetRecord);
            var oTargetCell = {record:oTargetRecord, column:oTargetColumn};

            var oAnchor = this._getSelectionAnchor();

            var allRows = this.getTbodyEl().rows;
            var startIndex, endIndex, currentRow, i, j;

            // Both SHIFT and CTRL
            if(bSHIFT && bCTRL) {

                // Validate anchor
                if(oAnchor) {
                    // Anchor is selected
                    if(this.isSelected(oAnchor.cell)) {
                        // All cells are on the same row
                        if(oAnchor.recordIndex === nTargetRecordIndex) {
                            // Select all cells between anchor cell and target cell, including target cell
                            if(oAnchor.colKeyIndex < nTargetColKeyIndex) {
                                for(i=oAnchor.colKeyIndex+1; i<=nTargetColKeyIndex; i++) {
                                    this.selectCell(elTargetRow.cells[i]);
                                }
                            }
                            // Select all cells between target cell and anchor cell, including target cell
                            else if(nTargetColKeyIndex < oAnchor.colKeyIndex) {
                                for(i=nTargetColKeyIndex; i<oAnchor.colKeyIndex; i++) {
                                    this.selectCell(elTargetRow.cells[i]);
                                }
                            }
                        }
                        // Anchor row is above target row
                        else if(oAnchor.recordIndex < nTargetRecordIndex) {
                            startIndex = Math.min(oAnchor.colKeyIndex, nTargetColKeyIndex);
                            endIndex = Math.max(oAnchor.colKeyIndex, nTargetColKeyIndex);

                            // Select all cells from startIndex to endIndex on rows between anchor row and target row
                            for(i=oAnchor.trIndex; i<=nTargetTrIndex; i++) {
                                for(j=startIndex; j<=endIndex; j++) {
                                    this.selectCell(allRows[i].cells[j]);
                                }
                            }
                        }
                        // Anchor row is below target row
                        else {
                            startIndex = Math.min(oAnchor.trIndex, nTargetColKeyIndex);
                            endIndex = Math.max(oAnchor.trIndex, nTargetColKeyIndex);

                            // Select all cells from startIndex to endIndex on rows between target row and anchor row
                            for(i=oAnchor.trIndex; i>=nTargetTrIndex; i--) {
                                for(j=endIndex; j>=startIndex; j--) {
                                    this.selectCell(allRows[i].cells[j]);
                                }
                            }
                        }
                    }
                    // Anchor cell is unselected
                    else {
                        // All cells are on the same row
                        if(oAnchor.recordIndex === nTargetRecordIndex) {
                            // Unselect all cells between anchor cell and target cell
                            if(oAnchor.colKeyIndex < nTargetColKeyIndex) {
                                for(i=oAnchor.colKeyIndex+1; i<nTargetColKeyIndex; i++) {
                                    this.unselectCell(elTargetRow.cells[i]);
                                }
                            }
                            // Select all cells between target cell and anchor cell
                            else if(nTargetColKeyIndex < oAnchor.colKeyIndex) {
                                for(i=nTargetColKeyIndex+1; i<oAnchor.colKeyIndex; i++) {
                                    this.unselectCell(elTargetRow.cells[i]);
                                }
                            }
                        }
                        // Anchor row is above target row
                        if(oAnchor.recordIndex < nTargetRecordIndex) {
                            // Unselect all cells from anchor cell to target cell
                            for(i=oAnchor.trIndex; i<=nTargetTrIndex; i++) {
                                currentRow = allRows[i];
                                for(j=0; j<currentRow.cells.length; j++) {
                                    // This is the anchor row, only unselect cells after the anchor cell
                                    if(currentRow.sectionRowIndex === oAnchor.trIndex) {
                                        if(j>oAnchor.colKeyIndex) {
                                            this.unselectCell(currentRow.cells[j]);
                                        }
                                    }
                                    // This is the target row, only unelect cells before the target cell
                                    else if(currentRow.sectionRowIndex === nTargetTrIndex) {
                                        if(j<nTargetColKeyIndex) {
                                            this.unselectCell(currentRow.cells[j]);
                                        }
                                    }
                                    // Unselect all cells on this row
                                    else {
                                        this.unselectCell(currentRow.cells[j]);
                                    }
                                }
                            }
                        }
                        // Anchor row is below target row
                        else {
                            // Unselect all cells from target cell to anchor cell
                            for(i=nTargetTrIndex; i<=oAnchor.trIndex; i++) {
                                currentRow = allRows[i];
                                for(j=0; j<currentRow.cells.length; j++) {
                                    // This is the target row, only unselect cells after the target cell
                                    if(currentRow.sectionRowIndex == nTargetTrIndex) {
                                        if(j>nTargetColKeyIndex) {
                                            this.unselectCell(currentRow.cells[j]);
                                        }
                                    }
                                    // This is the anchor row, only unselect cells before the anchor cell
                                    else if(currentRow.sectionRowIndex == oAnchor.trIndex) {
                                        if(j<oAnchor.colKeyIndex) {
                                            this.unselectCell(currentRow.cells[j]);
                                        }
                                    }
                                    // Unselect all cells on this row
                                    else {
                                        this.unselectCell(currentRow.cells[j]);
                                    }
                                }
                            }
                        }

                        // Select the target cell
                        this.selectCell(elTargetCell);
                    }
                }
                // Invalid anchor
                else {
                    // Set anchor
                    this._oAnchorCell = oTargetCell;

                    // Toggle selection of target
                    if(this.isSelected(oTargetCell)) {
                        this.unselectCell(oTargetCell);
                    }
                    else {
                        this.selectCell(oTargetCell);
                    }
                }

            }
             // Only SHIFT
            else if(bSHIFT) {
                this.unselectAllCells();

                // Validate anchor
                if(oAnchor) {
                    // All cells are on the same row
                    if(oAnchor.recordIndex === nTargetRecordIndex) {
                        // Select all cells between anchor cell and target cell,
                        // including the anchor cell and target cell
                        if(oAnchor.colKeyIndex < nTargetColKeyIndex) {
                            for(i=oAnchor.colKeyIndex; i<=nTargetColKeyIndex; i++) {
                                this.selectCell(elTargetRow.cells[i]);
                            }
                        }
                        // Select all cells between target cell and anchor cell
                        // including the target cell and anchor cell
                        else if(nTargetColKeyIndex < oAnchor.colKeyIndex) {
                            for(i=nTargetColKeyIndex; i<=oAnchor.colKeyIndex; i++) {
                                this.selectCell(elTargetRow.cells[i]);
                            }
                        }
                    }
                    // Anchor row is above target row
                    else if(oAnchor.recordIndex < nTargetRecordIndex) {
                        // Select the cellblock from anchor cell to target cell
                        // including the anchor cell and the target cell
                        startIndex = Math.min(oAnchor.colKeyIndex, nTargetColKeyIndex);
                        endIndex = Math.max(oAnchor.colKeyIndex, nTargetColKeyIndex);

                        for(i=oAnchor.trIndex; i<=nTargetTrIndex; i++) {
                            for(j=startIndex; j<=endIndex; j++) {
                                this.selectCell(allRows[i].cells[j]);
                            }
                        }
                    }
                    // Anchor row is below target row
                    else {
                        // Select the cellblock from target cell to anchor cell
                        // including the target cell and the anchor cell
                        startIndex = Math.min(oAnchor.colKeyIndex, nTargetColKeyIndex);
                        endIndex = Math.max(oAnchor.colKeyIndex, nTargetColKeyIndex);

                        for(i=nTargetTrIndex; i<=oAnchor.trIndex; i++) {
                            for(j=startIndex; j<=endIndex; j++) {
                                this.selectCell(allRows[i].cells[j]);
                            }
                        }
                    }
                }
                // Invalid anchor
                else {
                    // Set anchor
                    this._oAnchorCell = oTargetCell;

                    // Select target only
                    this.selectCell(oTargetCell);
                }
            }
            // Only CTRL
            else if(bCTRL) {

                // Set anchor
                this._oAnchorCell = oTargetCell;

                // Toggle selection of target
                if(this.isSelected(oTargetCell)) {
                    this.unselectCell(oTargetCell);
                }
                else {
                    this.selectCell(oTargetCell);
                }

            }
            // Neither SHIFT nor CTRL
            else {
                this._handleSingleCellSelectionByMouse(oArgs);
            }
        }
    },

    /**
     * Determines selection behavior resulting from a key event when selection mode
     * is set to "cellblock".
     *
     * @method _handleCellBlockSelectionByKey
     * @param e {HTMLEvent} Event object.
     * @private
     */
    _handleCellBlockSelectionByKey : function(e) {
        var nKey = Ev.getCharCode(e);
        var bSHIFT = e.shiftKey;
        if((nKey == 9) || !bSHIFT) {
            this._handleSingleCellSelectionByKey(e);
            return;
        }

        if((nKey > 36) && (nKey < 41)) {
            // Validate trigger
            var oTrigger = this._getSelectionTrigger();
            // Arrow selection only works if last selected row is on current page
            if(!oTrigger) {
                return null;
            }

            Ev.stopEvent(e);

            // Validate anchor
            var oAnchor = this._getSelectionAnchor(oTrigger);

            var i, startIndex, endIndex, elNew, elNewRow;
            var allRows = this.getTbodyEl().rows;
            var elThisRow = oTrigger.el.parentNode;

            // Determine which direction we're going to

            if(nKey == 40) { // arrow down
                // Selecting away from anchor cell
                if(oAnchor.recordIndex <= oTrigger.recordIndex) {
                    // Select the horiz block on the next row...
                    // ...making sure there is room below the trigger row
                    elNewRow = this.getNextTrEl(oTrigger.el);
                    if(elNewRow) {
                        startIndex = oAnchor.colKeyIndex;
                        endIndex = oTrigger.colKeyIndex;
                        // ...going left
                        if(startIndex > endIndex) {
                            for(i=startIndex; i>=endIndex; i--) {
                                elNew = elNewRow.cells[i];
                                this.selectCell(elNew);
                            }
                        }
                        // ... going right
                        else {
                            for(i=startIndex; i<=endIndex; i++) {
                                elNew = elNewRow.cells[i];
                                this.selectCell(elNew);
                            }
                        }
                    }
                }
                // Unselecting towards anchor cell
                else {
                    startIndex = Math.min(oAnchor.colKeyIndex, oTrigger.colKeyIndex);
                    endIndex = Math.max(oAnchor.colKeyIndex, oTrigger.colKeyIndex);
                    // Unselect the horiz block on this row towards the next row
                    for(i=startIndex; i<=endIndex; i++) {
                        this.unselectCell(elThisRow.cells[i]);
                    }
                }
            }
            // Arrow up
            else if(nKey == 38) {
                // Selecting away from anchor cell
                if(oAnchor.recordIndex >= oTrigger.recordIndex) {
                    // Select the horiz block on the previous row...
                    // ...making sure there is room
                    elNewRow = this.getPreviousTrEl(oTrigger.el);
                    if(elNewRow) {
                        // Select in order from anchor to trigger...
                        startIndex = oAnchor.colKeyIndex;
                        endIndex = oTrigger.colKeyIndex;
                        // ...going left
                        if(startIndex > endIndex) {
                            for(i=startIndex; i>=endIndex; i--) {
                                elNew = elNewRow.cells[i];
                                this.selectCell(elNew);
                            }
                        }
                        // ... going right
                        else {
                            for(i=startIndex; i<=endIndex; i++) {
                                elNew = elNewRow.cells[i];
                                this.selectCell(elNew);
                            }
                        }
                    }
                }
                // Unselecting towards anchor cell
                else {
                    startIndex = Math.min(oAnchor.colKeyIndex, oTrigger.colKeyIndex);
                    endIndex = Math.max(oAnchor.colKeyIndex, oTrigger.colKeyIndex);
                    // Unselect the horiz block on this row towards the previous row
                    for(i=startIndex; i<=endIndex; i++) {
                        this.unselectCell(elThisRow.cells[i]);
                    }
                }
            }
            // Arrow right
            else if(nKey == 39) {
                // Selecting away from anchor cell
                if(oAnchor.colKeyIndex <= oTrigger.colKeyIndex) {
                    // Select the next vert block to the right...
                    // ...making sure there is room
                    if(oTrigger.colKeyIndex < elThisRow.cells.length-1) {
                        // Select in order from anchor to trigger...
                        startIndex = oAnchor.trIndex;
                        endIndex = oTrigger.trIndex;
                        // ...going up
                        if(startIndex > endIndex) {
                            for(i=startIndex; i>=endIndex; i--) {
                                elNew = allRows[i].cells[oTrigger.colKeyIndex+1];
                                this.selectCell(elNew);
                            }
                        }
                        // ... going down
                        else {
                            for(i=startIndex; i<=endIndex; i++) {
                                elNew = allRows[i].cells[oTrigger.colKeyIndex+1];
                                this.selectCell(elNew);
                            }
                        }
                    }
                }
                // Unselecting towards anchor cell
                else {
                    // Unselect the vert block on this column towards the right
                    startIndex = Math.min(oAnchor.trIndex, oTrigger.trIndex);
                    endIndex = Math.max(oAnchor.trIndex, oTrigger.trIndex);
                    for(i=startIndex; i<=endIndex; i++) {
                        this.unselectCell(allRows[i].cells[oTrigger.colKeyIndex]);
                    }
                }
            }
            // Arrow left
            else if(nKey == 37) {
                // Selecting away from anchor cell
                if(oAnchor.colKeyIndex >= oTrigger.colKeyIndex) {
                    //Select the previous vert block to the left
                    if(oTrigger.colKeyIndex > 0) {
                        // Select in order from anchor to trigger...
                        startIndex = oAnchor.trIndex;
                        endIndex = oTrigger.trIndex;
                        // ...going up
                        if(startIndex > endIndex) {
                            for(i=startIndex; i>=endIndex; i--) {
                                elNew = allRows[i].cells[oTrigger.colKeyIndex-1];
                                this.selectCell(elNew);
                            }
                        }
                        // ... going down
                        else {
                            for(i=startIndex; i<=endIndex; i++) {
                                elNew = allRows[i].cells[oTrigger.colKeyIndex-1];
                                this.selectCell(elNew);
                            }
                        }
                    }
                }
                // Unselecting towards anchor cell
                else {
                    // Unselect the vert block on this column towards the left
                    startIndex = Math.min(oAnchor.trIndex, oTrigger.trIndex);
                    endIndex = Math.max(oAnchor.trIndex, oTrigger.trIndex);
                    for(i=startIndex; i<=endIndex; i++) {
                        this.unselectCell(allRows[i].cells[oTrigger.colKeyIndex]);
                    }
                }
            }
        }
    },

    /**
     * Determines selection behavior resulting from a mouse event when selection mode
     * is set to "cellrange".
     *
     * @method _handleCellRangeSelectionByMouse
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     * @private
     */
    _handleCellRangeSelectionByMouse : function(oArgs) {
        var elTarget = oArgs.target;

        // Validate target cell
        var elTargetCell = this.getTdEl(elTarget);
        if(elTargetCell) {
            var e = oArgs.event;
            var bSHIFT = e.shiftKey;
            var bCTRL = e.ctrlKey || ((navigator.userAgent.toLowerCase().indexOf("mac") != -1) && e.metaKey);

            var elTargetRow = this.getTrEl(elTargetCell);
            var nTargetTrIndex = this.getTrIndex(elTargetRow);
            var oTargetColumn = this.getColumn(elTargetCell);
            var nTargetColKeyIndex = oTargetColumn.getKeyIndex();
            var oTargetRecord = this.getRecord(elTargetRow);
            var nTargetRecordIndex = this._oRecordSet.getRecordIndex(oTargetRecord);
            var oTargetCell = {record:oTargetRecord, column:oTargetColumn};

            var oAnchor = this._getSelectionAnchor();

            var allRows = this.getTbodyEl().rows;
            var currentRow, i, j;

            // Both SHIFT and CTRL
            if(bSHIFT && bCTRL) {

                // Validate anchor
                if(oAnchor) {
                    // Anchor is selected
                    if(this.isSelected(oAnchor.cell)) {
                        // All cells are on the same row
                        if(oAnchor.recordIndex === nTargetRecordIndex) {
                            // Select all cells between anchor cell and target cell, including target cell
                            if(oAnchor.colKeyIndex < nTargetColKeyIndex) {
                                for(i=oAnchor.colKeyIndex+1; i<=nTargetColKeyIndex; i++) {
                                    this.selectCell(elTargetRow.cells[i]);
                                }
                            }
                            // Select all cells between target cell and anchor cell, including target cell
                            else if(nTargetColKeyIndex < oAnchor.colKeyIndex) {
                                for(i=nTargetColKeyIndex; i<oAnchor.colKeyIndex; i++) {
                                    this.selectCell(elTargetRow.cells[i]);
                                }
                            }
                        }
                        // Anchor row is above target row
                        else if(oAnchor.recordIndex < nTargetRecordIndex) {
                            // Select all cells on anchor row from anchor cell to the end of the row
                            for(i=oAnchor.colKeyIndex+1; i<elTargetRow.cells.length; i++) {
                                this.selectCell(elTargetRow.cells[i]);
                            }

                            // Select all cells on all rows between anchor row and target row
                            for(i=oAnchor.trIndex+1; i<nTargetTrIndex; i++) {
                                for(j=0; j<allRows[i].cells.length; j++){
                                    this.selectCell(allRows[i].cells[j]);
                                }
                            }

                            // Select all cells on target row from first cell to the target cell
                            for(i=0; i<=nTargetColKeyIndex; i++) {
                                this.selectCell(elTargetRow.cells[i]);
                            }
                        }
                        // Anchor row is below target row
                        else {
                            // Select all cells on target row from target cell to the end of the row
                            for(i=nTargetColKeyIndex; i<elTargetRow.cells.length; i++) {
                                this.selectCell(elTargetRow.cells[i]);
                            }

                            // Select all cells on all rows between target row and anchor row
                            for(i=nTargetTrIndex+1; i<oAnchor.trIndex; i++) {
                                for(j=0; j<allRows[i].cells.length; j++){
                                    this.selectCell(allRows[i].cells[j]);
                                }
                            }

                            // Select all cells on anchor row from first cell to the anchor cell
                            for(i=0; i<oAnchor.colKeyIndex; i++) {
                                this.selectCell(elTargetRow.cells[i]);
                            }
                        }
                    }
                    // Anchor cell is unselected
                    else {
                        // All cells are on the same row
                        if(oAnchor.recordIndex === nTargetRecordIndex) {
                            // Unselect all cells between anchor cell and target cell
                            if(oAnchor.colKeyIndex < nTargetColKeyIndex) {
                                for(i=oAnchor.colKeyIndex+1; i<nTargetColKeyIndex; i++) {
                                    this.unselectCell(elTargetRow.cells[i]);
                                }
                            }
                            // Select all cells between target cell and anchor cell
                            else if(nTargetColKeyIndex < oAnchor.colKeyIndex) {
                                for(i=nTargetColKeyIndex+1; i<oAnchor.colKeyIndex; i++) {
                                    this.unselectCell(elTargetRow.cells[i]);
                                }
                            }
                        }
                        // Anchor row is above target row
                        if(oAnchor.recordIndex < nTargetRecordIndex) {
                            // Unselect all cells from anchor cell to target cell
                            for(i=oAnchor.trIndex; i<=nTargetTrIndex; i++) {
                                currentRow = allRows[i];
                                for(j=0; j<currentRow.cells.length; j++) {
                                    // This is the anchor row, only unselect cells after the anchor cell
                                    if(currentRow.sectionRowIndex === oAnchor.trIndex) {
                                        if(j>oAnchor.colKeyIndex) {
                                            this.unselectCell(currentRow.cells[j]);
                                        }
                                    }
                                    // This is the target row, only unelect cells before the target cell
                                    else if(currentRow.sectionRowIndex === nTargetTrIndex) {
                                        if(j<nTargetColKeyIndex) {
                                            this.unselectCell(currentRow.cells[j]);
                                        }
                                    }
                                    // Unselect all cells on this row
                                    else {
                                        this.unselectCell(currentRow.cells[j]);
                                    }
                                }
                            }
                        }
                        // Anchor row is below target row
                        else {
                            // Unselect all cells from target cell to anchor cell
                            for(i=nTargetTrIndex; i<=oAnchor.trIndex; i++) {
                                currentRow = allRows[i];
                                for(j=0; j<currentRow.cells.length; j++) {
                                    // This is the target row, only unselect cells after the target cell
                                    if(currentRow.sectionRowIndex == nTargetTrIndex) {
                                        if(j>nTargetColKeyIndex) {
                                            this.unselectCell(currentRow.cells[j]);
                                        }
                                    }
                                    // This is the anchor row, only unselect cells before the anchor cell
                                    else if(currentRow.sectionRowIndex == oAnchor.trIndex) {
                                        if(j<oAnchor.colKeyIndex) {
                                            this.unselectCell(currentRow.cells[j]);
                                        }
                                    }
                                    // Unselect all cells on this row
                                    else {
                                        this.unselectCell(currentRow.cells[j]);
                                    }
                                }
                            }
                        }

                        // Select the target cell
                        this.selectCell(elTargetCell);
                    }
                }
                // Invalid anchor
                else {
                    // Set anchor
                    this._oAnchorCell = oTargetCell;

                    // Toggle selection of target
                    if(this.isSelected(oTargetCell)) {
                        this.unselectCell(oTargetCell);
                    }
                    else {
                        this.selectCell(oTargetCell);
                    }
                }
            }
             // Only SHIFT
            else if(bSHIFT) {

                this.unselectAllCells();

                // Validate anchor
                if(oAnchor) {
                    // All cells are on the same row
                    if(oAnchor.recordIndex === nTargetRecordIndex) {
                        // Select all cells between anchor cell and target cell,
                        // including the anchor cell and target cell
                        if(oAnchor.colKeyIndex < nTargetColKeyIndex) {
                            for(i=oAnchor.colKeyIndex; i<=nTargetColKeyIndex; i++) {
                                this.selectCell(elTargetRow.cells[i]);
                            }
                        }
                        // Select all cells between target cell and anchor cell
                        // including the target cell and anchor cell
                        else if(nTargetColKeyIndex < oAnchor.colKeyIndex) {
                            for(i=nTargetColKeyIndex; i<=oAnchor.colKeyIndex; i++) {
                                this.selectCell(elTargetRow.cells[i]);
                            }
                        }
                    }
                    // Anchor row is above target row
                    else if(oAnchor.recordIndex < nTargetRecordIndex) {
                        // Select all cells from anchor cell to target cell
                        // including the anchor cell and target cell
                        for(i=oAnchor.trIndex; i<=nTargetTrIndex; i++) {
                            currentRow = allRows[i];
                            for(j=0; j<currentRow.cells.length; j++) {
                                // This is the anchor row, only select the anchor cell and after
                                if(currentRow.sectionRowIndex == oAnchor.trIndex) {
                                    if(j>=oAnchor.colKeyIndex) {
                                        this.selectCell(currentRow.cells[j]);
                                    }
                                }
                                // This is the target row, only select the target cell and before
                                else if(currentRow.sectionRowIndex == nTargetTrIndex) {
                                    if(j<=nTargetColKeyIndex) {
                                        this.selectCell(currentRow.cells[j]);
                                    }
                                }
                                // Select all cells on this row
                                else {
                                    this.selectCell(currentRow.cells[j]);
                                }
                            }
                        }
                    }
                    // Anchor row is below target row
                    else {
                        // Select all cells from target cell to anchor cell,
                        // including the target cell and anchor cell
                        for(i=nTargetTrIndex; i<=oAnchor.trIndex; i++) {
                            currentRow = allRows[i];
                            for(j=0; j<currentRow.cells.length; j++) {
                                // This is the target row, only select the target cell and after
                                if(currentRow.sectionRowIndex == nTargetTrIndex) {
                                    if(j>=nTargetColKeyIndex) {
                                        this.selectCell(currentRow.cells[j]);
                                    }
                                }
                                // This is the anchor row, only select the anchor cell and before
                                else if(currentRow.sectionRowIndex == oAnchor.trIndex) {
                                    if(j<=oAnchor.colKeyIndex) {
                                        this.selectCell(currentRow.cells[j]);
                                    }
                                }
                                // Select all cells on this row
                                else {
                                    this.selectCell(currentRow.cells[j]);
                                }
                            }
                        }
                    }
                }
                // Invalid anchor
                else {
                    // Set anchor
                    this._oAnchorCell = oTargetCell;

                    // Select target only
                    this.selectCell(oTargetCell);
                }

            }
            // Only CTRL
            else if(bCTRL) {

                // Set anchor
                this._oAnchorCell = oTargetCell;

                // Toggle selection of target
                if(this.isSelected(oTargetCell)) {
                    this.unselectCell(oTargetCell);
                }
                else {
                    this.selectCell(oTargetCell);
                }

            }
            // Neither SHIFT nor CTRL
            else {
                this._handleSingleCellSelectionByMouse(oArgs);
            }
        }
    },

    /**
     * Determines selection behavior resulting from a key event when selection mode
     * is set to "cellrange".
     *
     * @method _handleCellRangeSelectionByKey
     * @param e {HTMLEvent} Event object.
     * @private
     */
    _handleCellRangeSelectionByKey : function(e) {
        var nKey = Ev.getCharCode(e);
        var bSHIFT = e.shiftKey;
        if((nKey == 9) || !bSHIFT) {
            this._handleSingleCellSelectionByKey(e);
            return;
        }

        if((nKey > 36) && (nKey < 41)) {
            // Validate trigger
            var oTrigger = this._getSelectionTrigger();
            // Arrow selection only works if last selected row is on current page
            if(!oTrigger) {
                return null;
            }

            Ev.stopEvent(e);

            // Validate anchor
            var oAnchor = this._getSelectionAnchor(oTrigger);

            var i, elNewRow, elNew;
            var allRows = this.getTbodyEl().rows;
            var elThisRow = oTrigger.el.parentNode;

            // Arrow down
            if(nKey == 40) {
                elNewRow = this.getNextTrEl(oTrigger.el);

                // Selecting away from anchor cell
                if(oAnchor.recordIndex <= oTrigger.recordIndex) {
                    // Select all cells to the end of this row
                    for(i=oTrigger.colKeyIndex+1; i<elThisRow.cells.length; i++){
                        elNew = elThisRow.cells[i];
                        this.selectCell(elNew);
                    }

                    // Select some of the cells on the next row down
                    if(elNewRow) {
                        for(i=0; i<=oTrigger.colKeyIndex; i++){
                            elNew = elNewRow.cells[i];
                            this.selectCell(elNew);
                        }
                    }
                }
                // Unselecting towards anchor cell
                else {
                    // Unselect all cells to the end of this row
                    for(i=oTrigger.colKeyIndex; i<elThisRow.cells.length; i++){
                        this.unselectCell(elThisRow.cells[i]);
                    }

                    // Unselect some of the cells on the next row down
                    if(elNewRow) {
                        for(i=0; i<oTrigger.colKeyIndex; i++){
                            this.unselectCell(elNewRow.cells[i]);
                        }
                    }
                }
            }
            // Arrow up
            else if(nKey == 38) {
                elNewRow = this.getPreviousTrEl(oTrigger.el);

                // Selecting away from anchor cell
                if(oAnchor.recordIndex >= oTrigger.recordIndex) {
                    // Select all the cells to the beginning of this row
                    for(i=oTrigger.colKeyIndex-1; i>-1; i--){
                        elNew = elThisRow.cells[i];
                        this.selectCell(elNew);
                    }

                    // Select some of the cells from the end of the previous row
                    if(elNewRow) {
                        for(i=elThisRow.cells.length-1; i>=oTrigger.colKeyIndex; i--){
                            elNew = elNewRow.cells[i];
                            this.selectCell(elNew);
                        }
                    }
                }
                // Unselecting towards anchor cell
                else {
                    // Unselect all the cells to the beginning of this row
                    for(i=oTrigger.colKeyIndex; i>-1; i--){
                        this.unselectCell(elThisRow.cells[i]);
                    }

                    // Unselect some of the cells from the end of the previous row
                    if(elNewRow) {
                        for(i=elThisRow.cells.length-1; i>oTrigger.colKeyIndex; i--){
                            this.unselectCell(elNewRow.cells[i]);
                        }
                    }
                }
            }
            // Arrow right
            else if(nKey == 39) {
                elNewRow = this.getNextTrEl(oTrigger.el);

                // Selecting away from anchor cell
                if(oAnchor.recordIndex < oTrigger.recordIndex) {
                    // Select the next cell to the right
                    if(oTrigger.colKeyIndex < elThisRow.cells.length-1) {
                        elNew = elThisRow.cells[oTrigger.colKeyIndex+1];
                        this.selectCell(elNew);
                    }
                    // Select the first cell of the next row
                    else if(elNewRow) {
                        elNew = elNewRow.cells[0];
                        this.selectCell(elNew);
                    }
                }
                // Unselecting towards anchor cell
                else if(oAnchor.recordIndex > oTrigger.recordIndex) {
                    this.unselectCell(elThisRow.cells[oTrigger.colKeyIndex]);

                    // Unselect this cell towards the right
                    if(oTrigger.colKeyIndex < elThisRow.cells.length-1) {
                    }
                    // Unselect this cells towards the first cell of the next row
                    else {
                    }
                }
                // Anchor is on this row
                else {
                    // Selecting away from anchor
                    if(oAnchor.colKeyIndex <= oTrigger.colKeyIndex) {
                        // Select the next cell to the right
                        if(oTrigger.colKeyIndex < elThisRow.cells.length-1) {
                            elNew = elThisRow.cells[oTrigger.colKeyIndex+1];
                            this.selectCell(elNew);
                        }
                        // Select the first cell on the next row
                        else if(oTrigger.trIndex < allRows.length-1){
                            elNew = elNewRow.cells[0];
                            this.selectCell(elNew);
                        }
                    }
                    // Unselecting towards anchor
                    else {
                        // Unselect this cell towards the right
                        this.unselectCell(elThisRow.cells[oTrigger.colKeyIndex]);
                    }
                }
            }
            // Arrow left
            else if(nKey == 37) {
                elNewRow = this.getPreviousTrEl(oTrigger.el);

                // Unselecting towards the anchor
                if(oAnchor.recordIndex < oTrigger.recordIndex) {
                    this.unselectCell(elThisRow.cells[oTrigger.colKeyIndex]);

                    // Unselect this cell towards the left
                    if(oTrigger.colKeyIndex > 0) {
                    }
                    // Unselect this cell towards the last cell of the previous row
                    else {
                    }
                }
                // Selecting towards the anchor
                else if(oAnchor.recordIndex > oTrigger.recordIndex) {
                    // Select the next cell to the left
                    if(oTrigger.colKeyIndex > 0) {
                        elNew = elThisRow.cells[oTrigger.colKeyIndex-1];
                        this.selectCell(elNew);
                    }
                    // Select the last cell of the previous row
                    else if(oTrigger.trIndex > 0){
                        elNew = elNewRow.cells[elNewRow.cells.length-1];
                        this.selectCell(elNew);
                    }
                }
                // Anchor is on this row
                else {
                    // Selecting away from anchor cell
                    if(oAnchor.colKeyIndex >= oTrigger.colKeyIndex) {
                        // Select the next cell to the left
                        if(oTrigger.colKeyIndex > 0) {
                            elNew = elThisRow.cells[oTrigger.colKeyIndex-1];
                            this.selectCell(elNew);
                        }
                        // Select the last cell of the previous row
                        else if(oTrigger.trIndex > 0){
                            elNew = elNewRow.cells[elNewRow.cells.length-1];
                            this.selectCell(elNew);
                        }
                    }
                    // Unselecting towards anchor cell
                    else {
                        this.unselectCell(elThisRow.cells[oTrigger.colKeyIndex]);

                        // Unselect this cell towards the left
                        if(oTrigger.colKeyIndex > 0) {
                        }
                        // Unselect this cell towards the last cell of the previous row
                        else {
                        }
                    }
                }
            }
        }
    },

    /**
     * Determines selection behavior resulting from a mouse event when selection mode
     * is set to "singlecell".
     *
     * @method _handleSingleCellSelectionByMouse
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     * @private
     */
    _handleSingleCellSelectionByMouse : function(oArgs) {
        var elTarget = oArgs.target;

        // Validate target cell
        var elTargetCell = this.getTdEl(elTarget);
        if(elTargetCell) {
            var elTargetRow = this.getTrEl(elTargetCell);
            var oTargetRecord = this.getRecord(elTargetRow);
            var oTargetColumn = this.getColumn(elTargetCell);
            var oTargetCell = {record:oTargetRecord, column:oTargetColumn};

            // Set anchor
            this._oAnchorCell = oTargetCell;

            // Select only target
            this.unselectAllCells();
            this.selectCell(oTargetCell);
        }
    },

    /**
     * Determines selection behavior resulting from a key event when selection mode
     * is set to "singlecell".
     *
     * @method _handleSingleCellSelectionByKey
     * @param e {HTMLEvent} Event object.
     * @private
     */
    _handleSingleCellSelectionByKey : function(e) {
        var nKey = Ev.getCharCode(e);
        if((nKey == 9) || ((nKey > 36) && (nKey < 41))) {
            var bSHIFT = e.shiftKey;

            // Validate trigger
            var oTrigger = this._getSelectionTrigger();
            // Arrow selection only works if last selected row is on current page
            if(!oTrigger) {
                return null;
            }

            // Determine the new cell to select
            var elNew;
            if(nKey == 40) { // Arrow down
                elNew = this.getBelowTdEl(oTrigger.el);

                // Validate new cell
                if(elNew === null) {
                    //TODO: wrap around to first tr on current page

                    //TODO: wrap forward to first tr of next page

                    // Bottom selection is sticky
                    elNew = oTrigger.el;
                }
            }
            else if(nKey == 38) { // Arrow up
                elNew = this.getAboveTdEl(oTrigger.el);

                // Validate new cell
                if(elNew === null) {
                    //TODO: wrap around to last tr on current page

                    //TODO: wrap back to last tr of previous page

                    // Top selection is sticky
                    elNew = oTrigger.el;
                }
            }
            else if((nKey == 39) || (!bSHIFT && (nKey == 9))) { // Arrow right or tab
                elNew = this.getNextTdEl(oTrigger.el);

                // Validate new cell
                if(elNew === null) {
                    //TODO: wrap around to first td on current page

                    //TODO: wrap forward to first td of next page

                    // Top-left selection is sticky, and release TAB focus
                    //elNew = oTrigger.el;
                    return;
                }
            }
            else if((nKey == 37) || (bSHIFT && (nKey == 9))) { // Arrow left or shift-tab
                elNew = this.getPreviousTdEl(oTrigger.el);

                // Validate new cell
                if(elNew === null) {
                    //TODO: wrap around to last td on current page

                    //TODO: wrap back to last td of previous page

                    // Bottom-right selection is sticky, and release TAB focus
                    //elNew = oTrigger.el;
                    return;
                }
            }

            Ev.stopEvent(e);

            // Unselect all cells
            this.unselectAllCells();

            // Select the new cell
            this.selectCell(elNew);

            // Set new anchor
            this._oAnchorCell = {record:this.getRecord(elNew), column:this.getColumn(elNew)};
        }
    },

    /**
     * Returns array of selected TR elements on the page.
     *
     * @method getSelectedTrEls
     * @return {HTMLElement[]} Array of selected TR elements.
     */
    getSelectedTrEls : function() {
        return Dom.getElementsByClassName(DT.CLASS_SELECTED,"tr",this._elTbody);
    },

    /**
     * Sets given row to the selected state.
     *
     * @method selectRow
     * @param row {HTMLElement | String | YAHOO.widget.Record | Number} HTML element
     * reference or ID string, Record instance, or RecordSet position index.
     */
    selectRow : function(row) {
        var oRecord, elRow;

        if(row instanceof YAHOO.widget.Record) {
            oRecord = this._oRecordSet.getRecord(row);
            elRow = this.getTrEl(oRecord);
        }
        else if(lang.isNumber(row)) {
            oRecord = this.getRecord(row);
            elRow = this.getTrEl(oRecord);
        }
        else {
            elRow = this.getTrEl(row);
            oRecord = this.getRecord(elRow);
        }

        if(oRecord) {
            // Update selection trackers
            var tracker = this._aSelections || [];
            var sRecordId = oRecord.getId();
            var index = -1;

            // Remove if already there:
            // Use Array.indexOf if available...
            /*if(tracker.indexOf && (tracker.indexOf(sRecordId) >  -1)) {
                tracker.splice(tracker.indexOf(sRecordId),1);
            }*/
            if(tracker.indexOf) {
                index = tracker.indexOf(sRecordId);

            }
            // ...or do it the old-fashioned way
            else {
                for(var j=tracker.length-1; j>-1; j--) {
                    if(tracker[j] === sRecordId){
                        index = j;
                        break;
                    }
                }
            }
            if(index > -1) {
                tracker.splice(index,1);
            }

            // Add to the end
            tracker.push(sRecordId);
            this._aSelections = tracker;

            // Update trackers
            if(!this._oAnchorRecord) {
                this._oAnchorRecord = oRecord;
            }

            // Update UI
            if(elRow) {
                Dom.addClass(elRow, DT.CLASS_SELECTED);
            }

            this.fireEvent("rowSelectEvent", {record:oRecord, el:elRow});
            YAHOO.log("Selected " + elRow, "info", this.toString());
        }
        else {
            YAHOO.log("Could not select row " + row, "warn", this.toString());
        }
    },

    /**
     * Sets given row to the unselected state.
     *
     * @method unselectRow
     * @param row {HTMLElement | String | YAHOO.widget.Record | Number} HTML element
     * reference or ID string, Record instance, or RecordSet position index.
     */
    unselectRow : function(row) {
        var elRow = this.getTrEl(row);

        var oRecord;
        if(row instanceof YAHOO.widget.Record) {
            oRecord = this._oRecordSet.getRecord(row);
        }
        else if(lang.isNumber(row)) {
            oRecord = this.getRecord(row);
        }
        else {
            oRecord = this.getRecord(elRow);
        }

        if(oRecord) {
            // Update selection trackers
            var tracker = this._aSelections || [];
            var sRecordId = oRecord.getId();
            var index = -1;

            // Use Array.indexOf if available...
            if(tracker.indexOf) {
                index = tracker.indexOf(sRecordId);
            }
            // ...or do it the old-fashioned way
            else {
                for(var j=tracker.length-1; j>-1; j--) {
                    if(tracker[j] === sRecordId){
                        index = j;
                        break;
                    }
                }
            }
            if(index > -1) {
                // Update tracker
                tracker.splice(index,1);
                this._aSelections = tracker;

                // Update the UI
                Dom.removeClass(elRow, DT.CLASS_SELECTED);

                this.fireEvent("rowUnselectEvent", {record:oRecord, el:elRow});
                YAHOO.log("Unselected " + elRow, "info", this.toString());

                return;
            }
        }
        YAHOO.log("Could not unselect row " + row, "warn", this.toString());
    },

    /**
     * Clears out all row selections.
     *
     * @method unselectAllRows
     */
    unselectAllRows : function() {
        // Remove all rows from tracker
        var tracker = this._aSelections || [],
            recId,
            removed = [];
        for(var j=tracker.length-1; j>-1; j--) {
           if(lang.isString(tracker[j])){
                recId = tracker.splice(j,1);
                removed[removed.length] = this.getRecord(lang.isArray(recId) ? recId[0] : recId);
            }
        }

        // Update tracker
        this._aSelections = tracker;

        // Update UI
        this._unselectAllTrEls();

        this.fireEvent("unselectAllRowsEvent", {records: removed});
        YAHOO.log("Unselected all rows", "info", this.toString());
    },

    /**
     * Convenience method to remove the class YAHOO.widget.DataTable.CLASS_SELECTED
     * from all TD elements in the internal tracker.
     *
     * @method _unselectAllTdEls
     * @private
     */
    _unselectAllTdEls : function() {
        var selectedCells = Dom.getElementsByClassName(DT.CLASS_SELECTED,"td",this._elTbody);
        Dom.removeClass(selectedCells, DT.CLASS_SELECTED);
    },

    /**
     * Returns array of selected TD elements on the page.
     *
     * @method getSelectedTdEls
     * @return {HTMLElement[]} Array of selected TD elements.
     */
    getSelectedTdEls : function() {
        return Dom.getElementsByClassName(DT.CLASS_SELECTED,"td",this._elTbody);
    },

    /**
     * Sets given cell to the selected state.
     *
     * @method selectCell
     * @param cell {HTMLElement | String | Object} TD element or child of a TD element, or
     * object literal of syntax {record:oRecord, column:oColumn}.
     */
    selectCell : function(cell) {
    //TODO: accept {record} in selectCell()
        var elCell = this.getTdEl(cell);

        if(elCell) {
            var oRecord = this.getRecord(elCell);
            var oColumn = this.getColumn(this.getCellIndex(elCell));
            var sColumnKey = oColumn.getKey();

            if(oRecord && sColumnKey) {
                // Get Record ID
                var tracker = this._aSelections || [];
                var sRecordId = oRecord.getId();

                // Remove if there
                for(var j=tracker.length-1; j>-1; j--) {
                   if((tracker[j].recordId === sRecordId) && (tracker[j].columnKey === sColumnKey)){
                        tracker.splice(j,1);
                        break;
                    }
                }

                // Add to the end
                tracker.push({recordId:sRecordId, columnKey:sColumnKey});

                // Update trackers
                this._aSelections = tracker;
                if(!this._oAnchorCell) {
                    this._oAnchorCell = {record:oRecord, column:oColumn};
                }

                // Update the UI
                Dom.addClass(elCell, DT.CLASS_SELECTED);

                this.fireEvent("cellSelectEvent", {record:oRecord, column:oColumn, key: sColumnKey, el:elCell});
                YAHOO.log("Selected " + elCell, "info", this.toString());
                return;
            }
        }
        YAHOO.log("Could not select cell " + cell, "warn", this.toString());
    },

    /**
     * Sets given cell to the unselected state.
     *
     * @method unselectCell
     * @param cell {HTMLElement | String | Object} TD element or child of a TD element, or
     * object literal of syntax {record:oRecord, column:oColumn}.
     * @param cell {HTMLElement | String} DOM element reference or ID string
     * to DataTable page element or RecordSet index.
     */
    unselectCell : function(cell) {
        var elCell = this.getTdEl(cell);

        if(elCell) {
            var oRecord = this.getRecord(elCell);
            var oColumn = this.getColumn(this.getCellIndex(elCell));
            var sColumnKey = oColumn.getKey();

            if(oRecord && sColumnKey) {
                // Get Record ID
                var tracker = this._aSelections || [];
                var id = oRecord.getId();

                // Is it selected?
                for(var j=tracker.length-1; j>-1; j--) {
                    if((tracker[j].recordId === id) && (tracker[j].columnKey === sColumnKey)){
                        // Remove from tracker
                        tracker.splice(j,1);

                        // Update tracker
                        this._aSelections = tracker;

                        // Update the UI
                        Dom.removeClass(elCell, DT.CLASS_SELECTED);

                        this.fireEvent("cellUnselectEvent", {record:oRecord, column: oColumn, key:sColumnKey, el:elCell});
                        YAHOO.log("Unselected " + elCell, "info", this.toString());
                        return;
                    }
                }
            }
        }
        YAHOO.log("Could not unselect cell " + cell, "warn", this.toString());
    },

    /**
     * Clears out all cell selections.
     *
     * @method unselectAllCells
     */
    unselectAllCells : function() {
        // Remove all cells from tracker
        var tracker = this._aSelections || [];
        for(var j=tracker.length-1; j>-1; j--) {
           if(lang.isObject(tracker[j])){
                tracker.splice(j,1);
            }
        }

        // Update tracker
        this._aSelections = tracker;

        // Update UI
        this._unselectAllTdEls();

        //TODO: send data to unselectAllCellsEvent handler
        this.fireEvent("unselectAllCellsEvent");
        YAHOO.log("Unselected all cells", "info", this.toString());
    },

    /**
     * Returns true if given item is selected, false otherwise.
     *
     * @method isSelected
     * @param o {String | HTMLElement | YAHOO.widget.Record | Number
     * {record:YAHOO.widget.Record, column:YAHOO.widget.Column} } TR or TD element by
     * reference or ID string, a Record instance, a RecordSet position index,
     * or an object literal representation
     * of a cell.
     * @return {Boolean} True if item is selected.
     */
    isSelected : function(o) {
        if(o && (o.ownerDocument == document)) {
            return (Dom.hasClass(this.getTdEl(o),DT.CLASS_SELECTED) || Dom.hasClass(this.getTrEl(o),DT.CLASS_SELECTED));
        }
        else {
            var oRecord, sRecordId, j;
            var tracker = this._aSelections;
            if(tracker && tracker.length > 0) {
                // Looking for a Record?
                if(o instanceof YAHOO.widget.Record) {
                    oRecord = o;
                }
                else if(lang.isNumber(o)) {
                    oRecord = this.getRecord(o);
                }
                if(oRecord) {
                    sRecordId = oRecord.getId();

                    // Is it there?
                    // Use Array.indexOf if available...
                    if(tracker.indexOf) {
                        if(tracker.indexOf(sRecordId) >  -1) {
                            return true;
                        }
                    }
                    // ...or do it the old-fashioned way
                    else {
                        for(j=tracker.length-1; j>-1; j--) {
                           if(tracker[j] === sRecordId){
                            return true;
                           }
                        }
                    }
                }
                // Looking for a cell
                else if(o.record && o.column){
                    sRecordId = o.record.getId();
                    var sColumnKey = o.column.getKey();

                    for(j=tracker.length-1; j>-1; j--) {
                        if((tracker[j].recordId === sRecordId) && (tracker[j].columnKey === sColumnKey)){
                            return true;
                        }
                    }
                }
            }
        }
        return false;
    },

    /**
     * Returns selected rows as an array of Record IDs.
     *
     * @method getSelectedRows
     * @return {String[]} Array of selected rows by Record ID.
     */
    getSelectedRows : function() {
        var aSelectedRows = [];
        var tracker = this._aSelections || [];
        for(var j=0; j<tracker.length; j++) {
           if(lang.isString(tracker[j])){
                aSelectedRows.push(tracker[j]);
            }
        }
        return aSelectedRows;
    },

    /**
     * Returns selected cells as an array of object literals:
     *     {recordId:sRecordId, columnKey:sColumnKey}.
     *
     * @method getSelectedCells
     * @return {Object[]} Array of selected cells by Record ID and Column ID.
     */
    getSelectedCells : function() {
        var aSelectedCells = [];
        var tracker = this._aSelections || [];
        for(var j=0; j<tracker.length; j++) {
           if(tracker[j] && lang.isObject(tracker[j])){
                aSelectedCells.push(tracker[j]);
            }
        }
        return aSelectedCells;
    },

    /**
     * Returns last selected Record ID.
     *
     * @method getLastSelectedRecord
     * @return {String} Record ID of last selected row.
     */
    getLastSelectedRecord : function() {
        var tracker = this._aSelections;
        if(tracker && tracker.length > 0) {
            for(var i=tracker.length-1; i>-1; i--) {
               if(lang.isString(tracker[i])){
                    return tracker[i];
                }
            }
        }
    },

    /**
     * Returns last selected cell as an object literal:
     *     {recordId:sRecordId, columnKey:sColumnKey}.
     *
     * @method getLastSelectedCell
     * @return {Object} Object literal representation of a cell.
     */
    getLastSelectedCell : function() {
        var tracker = this._aSelections;
        if(tracker && tracker.length > 0) {
            for(var i=tracker.length-1; i>-1; i--) {
               if(tracker[i].recordId && tracker[i].columnKey){
                    return tracker[i];
                }
            }
        }
    },

    /**
     * Assigns the class YAHOO.widget.DataTable.CLASS_HIGHLIGHTED to the given row.
     *
     * @method highlightRow
     * @param row {HTMLElement | String} DOM element reference or ID string.
     */
    highlightRow : function(row) {
        var elRow = this.getTrEl(row);

        if(elRow) {
            // Make sure previous row is unhighlighted
    /*        if(this._sLastHighlightedTrElId) {
                Dom.removeClass(this._sLastHighlightedTrElId,DT.CLASS_HIGHLIGHTED);
            }*/
            var oRecord = this.getRecord(elRow);
            Dom.addClass(elRow,DT.CLASS_HIGHLIGHTED);
            //this._sLastHighlightedTrElId = elRow.id;
            this.fireEvent("rowHighlightEvent", {record:oRecord, el:elRow});
            YAHOO.log("Highlighted " + elRow, "info", this.toString());
            return;
        }
        YAHOO.log("Could not highlight row " + row, "warn", this.toString());
    },

    /**
     * Removes the class YAHOO.widget.DataTable.CLASS_HIGHLIGHTED from the given row.
     *
     * @method unhighlightRow
     * @param row {HTMLElement | String} DOM element reference or ID string.
     */
    unhighlightRow : function(row) {
        var elRow = this.getTrEl(row);

        if(elRow) {
            var oRecord = this.getRecord(elRow);
            Dom.removeClass(elRow,DT.CLASS_HIGHLIGHTED);
            this.fireEvent("rowUnhighlightEvent", {record:oRecord, el:elRow});
            YAHOO.log("Unhighlighted " + elRow, "info", this.toString());
            return;
        }
        YAHOO.log("Could not unhighlight row " + row, "warn", this.toString());
    },

    /**
     * Assigns the class YAHOO.widget.DataTable.CLASS_HIGHLIGHTED to the given cell.
     *
     * @method highlightCell
     * @param cell {HTMLElement | String} DOM element reference or ID string.
     */
    highlightCell : function(cell) {
        var elCell = this.getTdEl(cell);

        if(elCell) {
            // Make sure previous cell is unhighlighted
            if(this._elLastHighlightedTd) {
                this.unhighlightCell(this._elLastHighlightedTd);
            }

            var oRecord = this.getRecord(elCell);
            var oColumn = this.getColumn(this.getCellIndex(elCell));
            var sColumnKey = oColumn.getKey();
            Dom.addClass(elCell,DT.CLASS_HIGHLIGHTED);
            this._elLastHighlightedTd = elCell;
            this.fireEvent("cellHighlightEvent", {record:oRecord, column:oColumn, key:sColumnKey, el:elCell});
            YAHOO.log("Highlighted " + elCell, "info", this.toString());
            return;
        }
        YAHOO.log("Could not highlight cell " + cell, "warn", this.toString());
    },

    /**
     * Removes the class YAHOO.widget.DataTable.CLASS_HIGHLIGHTED from the given cell.
     *
     * @method unhighlightCell
     * @param cell {HTMLElement | String} DOM element reference or ID string.
     */
    unhighlightCell : function(cell) {
        var elCell = this.getTdEl(cell);

        if(elCell) {
            var oRecord = this.getRecord(elCell);
            Dom.removeClass(elCell,DT.CLASS_HIGHLIGHTED);
            this._elLastHighlightedTd = null;
            this.fireEvent("cellUnhighlightEvent", {record:oRecord, column:this.getColumn(this.getCellIndex(elCell)), key:this.getColumn(this.getCellIndex(elCell)).getKey(), el:elCell});
            YAHOO.log("Unhighlighted " + elCell, "info", this.toString());
            return;
        }
        YAHOO.log("Could not unhighlight cell " + cell, "warn", this.toString());
    },

    // INLINE EDITING

    /**
     * Assigns CellEditor instance to existing Column.
     * @method addCellEditor
     * @param oColumn {YAHOO.widget.Column} Column instance.
     * @param oEditor {YAHOO.wdiget.CellEditor} CellEditor instance.
     */
    addCellEditor : function(oColumn, oEditor) {
        oColumn.editor = oEditor;
        oColumn.editor.subscribe("showEvent", this._onEditorShowEvent, this, true);
        oColumn.editor.subscribe("keydownEvent", this._onEditorKeydownEvent, this, true);
        oColumn.editor.subscribe("revertEvent", this._onEditorRevertEvent, this, true);
        oColumn.editor.subscribe("saveEvent", this._onEditorSaveEvent, this, true);
        oColumn.editor.subscribe("cancelEvent", this._onEditorCancelEvent, this, true);
        oColumn.editor.subscribe("blurEvent", this._onEditorBlurEvent, this, true);
        oColumn.editor.subscribe("blockEvent", this._onEditorBlockEvent, this, true);
        oColumn.editor.subscribe("unblockEvent", this._onEditorUnblockEvent, this, true);
    },

    /**
     * Returns current CellEditor instance, or null.
     * @method getCellEditor
     * @return {YAHOO.widget.CellEditor} CellEditor instance.
     */
    getCellEditor : function() {
        return this._oCellEditor;
    },

    /**
     * Activates and shows CellEditor instance for the given cell while deactivating and
     * canceling previous CellEditor. It is baked into DataTable that only one CellEditor
     * can be active at any given time.
     *
     * @method showCellEditor
     * @param elCell {HTMLElement | String} Cell to edit.
     */
    showCellEditor : function(elCell, oRecord, oColumn) {
        // Get a particular CellEditor
        elCell = this.getTdEl(elCell);
        if(elCell) {
            oColumn = this.getColumn(elCell);
            if(oColumn && oColumn.editor) {
                var oCellEditor = this._oCellEditor;
                // Clean up active CellEditor
                if(oCellEditor) {
                    if(this._oCellEditor.cancel) {
                        this._oCellEditor.cancel();
                    }
                    else if(oCellEditor.isActive) {
                        this.cancelCellEditor();
                    }
                }

                if(oColumn.editor instanceof YAHOO.widget.BaseCellEditor) {
                    // Get CellEditor
                    oCellEditor = oColumn.editor;
                    var ok = oCellEditor.attach(this, elCell);
                    if(ok) {
                        oCellEditor.render();
                        oCellEditor.move();
                        ok = this.doBeforeShowCellEditor(oCellEditor);
                        if(ok) {
                            oCellEditor.show();
                            this._oCellEditor = oCellEditor;
                        }
                    }
                }
                // Backward compatibility
                else {
                        if(!oRecord || !(oRecord instanceof YAHOO.widget.Record)) {
                            oRecord = this.getRecord(elCell);
                        }
                        if(!oColumn || !(oColumn instanceof YAHOO.widget.Column)) {
                            oColumn = this.getColumn(elCell);
                        }
                        if(oRecord && oColumn) {
                            if(!this._oCellEditor || this._oCellEditor.container) {
                                this._initCellEditorEl();
                            }

                            // Update Editor values
                            oCellEditor = this._oCellEditor;
                            oCellEditor.cell = elCell;
                            oCellEditor.record = oRecord;
                            oCellEditor.column = oColumn;
                            oCellEditor.validator = (oColumn.editorOptions &&
                                    lang.isFunction(oColumn.editorOptions.validator)) ?
                                    oColumn.editorOptions.validator : null;
                            oCellEditor.value = oRecord.getData(oColumn.key);
                            oCellEditor.defaultValue = null;

                            // Move Editor
                            var elContainer = oCellEditor.container;
                            var x = Dom.getX(elCell);
                            var y = Dom.getY(elCell);

                            // SF doesn't get xy for cells in scrolling table
                            // when tbody display is set to block
                            if(isNaN(x) || isNaN(y)) {
                                x = elCell.offsetLeft + // cell pos relative to table
                                        Dom.getX(this._elTbody.parentNode) - // plus table pos relative to document
                                        this._elTbody.scrollLeft; // minus tbody scroll
                                y = elCell.offsetTop + // cell pos relative to table
                                        Dom.getY(this._elTbody.parentNode) - // plus table pos relative to document
                                        this._elTbody.scrollTop + // minus tbody scroll
                                        this._elThead.offsetHeight; // account for fixed THEAD cells
                            }

                            elContainer.style.left = x + "px";
                            elContainer.style.top = y + "px";

                            // Hook to customize the UI
                            this.doBeforeShowCellEditor(this._oCellEditor);

                            //TODO: This is temporarily up here due so elements can be focused
                            // Show Editor
                            elContainer.style.display = "";

                            // Handle ESC key
                            Ev.addListener(elContainer, "keydown", function(e, oSelf) {
                                // ESC hides Cell Editor
                                if((e.keyCode == 27)) {
                                    oSelf.cancelCellEditor();
                                    oSelf.focusTbodyEl();
                                }
                                else {
                                    oSelf.fireEvent("editorKeydownEvent", {editor:oSelf._oCellEditor, event:e});
                                }
                            }, this);

                            // Render Editor markup
                            var fnEditor;
                            if(lang.isString(oColumn.editor)) {
                                switch(oColumn.editor) {
                                    case "checkbox":
                                        fnEditor = DT.editCheckbox;
                                        break;
                                    case "date":
                                        fnEditor = DT.editDate;
                                        break;
                                    case "dropdown":
                                        fnEditor = DT.editDropdown;
                                        break;
                                    case "radio":
                                        fnEditor = DT.editRadio;
                                        break;
                                    case "textarea":
                                        fnEditor = DT.editTextarea;
                                        break;
                                    case "textbox":
                                        fnEditor = DT.editTextbox;
                                        break;
                                    default:
                                        fnEditor = null;
                                }
                            }
                            else if(lang.isFunction(oColumn.editor)) {
                                fnEditor = oColumn.editor;
                            }

                            if(fnEditor) {
                                // Create DOM input elements
                                fnEditor(this._oCellEditor, this);

                                // Show Save/Cancel buttons
                                if(!oColumn.editorOptions || !oColumn.editorOptions.disableBtns) {
                                    this.showCellEditorBtns(elContainer);
                                }

                                oCellEditor.isActive = true;

                                //TODO: verify which args to pass
                                this.fireEvent("editorShowEvent", {editor:oCellEditor});
                                YAHOO.log("Cell Editor shown for " + elCell, "info", this.toString());
                                return;
                            }
                        }

                }
            }
        }
    },

    /**
     * Backward compatibility.
     *
     * @method _initCellEditorEl
     * @private
     * @deprecated Use BaseCellEditor class.
     */
    _initCellEditorEl : function() {
        // Attach Cell Editor container element as first child of body
        var elCellEditor = document.createElement("div");
        elCellEditor.id = this._sId + "-celleditor";
        elCellEditor.style.display = "none";
        elCellEditor.tabIndex = 0;
        Dom.addClass(elCellEditor, DT.CLASS_EDITOR);
        var elFirstChild = Dom.getFirstChild(document.body);
        if(elFirstChild) {
            elCellEditor = Dom.insertBefore(elCellEditor, elFirstChild);
        }
        else {
            elCellEditor = document.body.appendChild(elCellEditor);
        }

        // Internal tracker of Cell Editor values
        var oCellEditor = {};
        oCellEditor.container = elCellEditor;
        oCellEditor.value = null;
        oCellEditor.isActive = false;
        this._oCellEditor = oCellEditor;
    },

    /**
     * Overridable abstract method to customize CellEditor before showing.
     *
     * @method doBeforeShowCellEditor
     * @param oCellEditor {YAHOO.widget.CellEditor} The CellEditor instance.
     * @return {Boolean} Return true to continue showing CellEditor.
     */
    doBeforeShowCellEditor : function(oCellEditor) {
        return true;
    },

    /**
     * Saves active CellEditor input to Record and upates DOM UI.
     *
     * @method saveCellEditor
     */
    saveCellEditor : function() {
        if(this._oCellEditor) {
            if(this._oCellEditor.save) {
                this._oCellEditor.save();
            }
            // Backward compatibility
            else if(this._oCellEditor.isActive) {
                var newData = this._oCellEditor.value;
                // Copy the data to pass to the event
                //var oldData = YAHOO.widget.DataTable._cloneObject(this._oCellEditor.record.getData(this._oCellEditor.column.key));
                var oldData = this._oCellEditor.record.getData(this._oCellEditor.column.key);

                // Validate input data
                if(this._oCellEditor.validator) {
                    newData = this._oCellEditor.value = this._oCellEditor.validator.call(this, newData, oldData, this._oCellEditor);
                    if(newData === null ) {
                        this.resetCellEditor();
                        this.fireEvent("editorRevertEvent",
                                {editor:this._oCellEditor, oldData:oldData, newData:newData});
                        YAHOO.log("Could not save Cell Editor input due to invalid data " +
                                lang.dump(newData), "warn", this.toString());
                        return;
                    }
                }
                // Update the Record
                this._oRecordSet.updateRecordValue(this._oCellEditor.record, this._oCellEditor.column.key, this._oCellEditor.value);
                // Update the UI
                this.formatCell(this._oCellEditor.cell.firstChild, this._oCellEditor.record, this._oCellEditor.column);

                // Bug fix 1764044
                this._oChainRender.add({
                    method: function() {
                        this.validateColumnWidths();
                    },
                    scope: this
                });
                this._oChainRender.run();
                // Clear out the Cell Editor
                this.resetCellEditor();

                this.fireEvent("editorSaveEvent",
                        {editor:this._oCellEditor, oldData:oldData, newData:newData});
                YAHOO.log("Cell Editor input saved", "info", this.toString());
            }
        }
    },

    /**
     * Cancels active CellEditor.
     *
     * @method cancelCellEditor
     */
    cancelCellEditor : function() {
        if(this._oCellEditor) {
            if(this._oCellEditor.cancel) {
                this._oCellEditor.cancel();
            }
            // Backward compatibility
            else if(this._oCellEditor.isActive) {
                this.resetCellEditor();
                //TODO: preserve values for the event?
                this.fireEvent("editorCancelEvent", {editor:this._oCellEditor});
                YAHOO.log("Cell Editor input canceled", "info", this.toString());
            }

            YAHOO.log("CellEditor input canceled", "info", this.toString());
        }
    },

    /**
     * Destroys active CellEditor instance and UI.
     *
     * @method destroyCellEditor
     */
    destroyCellEditor : function() {
        if(this._oCellEditor) {
            this._oCellEditor.destroy();
            this._oCellEditor = null;
        }
    },

    /**
     * Passes through showEvent of the active CellEditor.
     *
     * @method _onEditorShowEvent
     * @param oArgs {Object}  Custom Event args.
     * @private
     */
    _onEditorShowEvent : function(oArgs) {
        this.fireEvent("editorShowEvent", oArgs);
    },

    /**
     * Passes through keydownEvent of the active CellEditor.
     * @param oArgs {Object}  Custom Event args.
     *
     * @method _onEditorKeydownEvent
     * @private
     */
    _onEditorKeydownEvent : function(oArgs) {
        this.fireEvent("editorKeydownEvent", oArgs);
    },

    /**
     * Passes through revertEvent of the active CellEditor.
     *
     * @method _onEditorRevertEvent
     * @param oArgs {Object}  Custom Event args.
     * @private
     */
    _onEditorRevertEvent : function(oArgs) {
        this.fireEvent("editorRevertEvent", oArgs);
    },

    /**
     * Passes through saveEvent of the active CellEditor.
     *
     * @method _onEditorSaveEvent
     * @param oArgs {Object}  Custom Event args.
     * @private
     */
    _onEditorSaveEvent : function(oArgs) {
        this.fireEvent("editorSaveEvent", oArgs);
    },

    /**
     * Passes through cancelEvent of the active CellEditor.
     *
     * @method _onEditorCancelEvent
     * @param oArgs {Object}  Custom Event args.
     * @private
     */
    _onEditorCancelEvent : function(oArgs) {
        this.fireEvent("editorCancelEvent", oArgs);
    },

    /**
     * Passes through blurEvent of the active CellEditor.
     *
     * @method _onEditorBlurEvent
     * @param oArgs {Object}  Custom Event args.
     * @private
     */
    _onEditorBlurEvent : function(oArgs) {
        this.fireEvent("editorBlurEvent", oArgs);
    },

    /**
     * Passes through blockEvent of the active CellEditor.
     *
     * @method _onEditorBlockEvent
     * @param oArgs {Object}  Custom Event args.
     * @private
     */
    _onEditorBlockEvent : function(oArgs) {
        this.fireEvent("editorBlockEvent", oArgs);
    },

    /**
     * Passes through unblockEvent of the active CellEditor.
     *
     * @method _onEditorUnblockEvent
     * @param oArgs {Object}  Custom Event args.
     * @private
     */
    _onEditorUnblockEvent : function(oArgs) {
        this.fireEvent("editorUnblockEvent", oArgs);
    },

    /**
     * Public handler of the editorBlurEvent. By default, saves on blur if
     * disableBtns is true, otherwise cancels on blur.
     *
     * @method onEditorBlurEvent
     * @param oArgs {Object}  Custom Event args.
     */
    onEditorBlurEvent : function(oArgs) {
        if(oArgs.editor.disableBtns) {
            // Save on blur
            if(oArgs.editor.save) { // Backward incompatible
                oArgs.editor.save();
            }
        }
        else if(oArgs.editor.cancel) { // Backward incompatible
            // Cancel on blur
            oArgs.editor.cancel();
        }
    },

    /**
     * Public handler of the editorBlockEvent. By default, disables DataTable UI.
     *
     * @method onEditorBlockEvent
     * @param oArgs {Object}  Custom Event args.
     */
    onEditorBlockEvent : function(oArgs) {
        this.disable();
    },

    /**
     * Public handler of the editorUnblockEvent. By default, undisables DataTable UI.
     *
     * @method onEditorUnblockEvent
     * @param oArgs {Object}  Custom Event args.
     */
    onEditorUnblockEvent : function(oArgs) {
        this.undisable();
    },

    // ABSTRACT METHODS

    /**
     * Overridable method gives implementers a hook to access data before
     * it gets added to RecordSet and rendered to the TBODY.
     *
     * @method doBeforeLoadData
     * @param sRequest {String} Original request.
     * @param oResponse {Object} <a href="http://developer.yahoo.com/yui/datasource/#ds_oParsedResponse">Response object</a>.
     * @param oPayload {MIXED} additional arguments
     * @return {Boolean} Return true to continue loading data into RecordSet and
     * updating DataTable with new Records, false to cancel.
     */
    doBeforeLoadData : function(sRequest, oResponse, oPayload) {
        return true;
    },

    /////////////////////////////////////////////////////////////////////////////
    //
    // Public Custom Event Handlers
    //
    /////////////////////////////////////////////////////////////////////////////

    /**
     * Custom event handler to sort Column.
     *
     * @method onEventSortColumn
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventSortColumn : function(oArgs) {
    //TODO: support form elements in sortable columns
        var evt = oArgs.event;
        var target = oArgs.target;

        var el = this.getThEl(target) || this.getTdEl(target);
        if(el) {
            var oColumn = this.getColumn(el);
            if(oColumn.sortable) {
                Ev.stopEvent(evt);
                this.sortColumn(oColumn);
            }
        }
        else {
            YAHOO.log("Could not find Column for " + target, "warn", this.toString());
        }
    },

    /**
     * Custom event handler to select Column.
     *
     * @method onEventSelectColumn
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventSelectColumn : function(oArgs) {
        this.selectColumn(oArgs.target);
    },

    /**
     * Custom event handler to highlight Column. Accounts for spurious
     * caused-by-child events.
     *
     * @method onEventHighlightColumn
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventHighlightColumn : function(oArgs) {
        this.highlightColumn(oArgs.target);
    },

    /**
     * Custom event handler to unhighlight Column. Accounts for spurious
     * caused-by-child events.
     *
     * @method onEventUnhighlightColumn
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventUnhighlightColumn : function(oArgs) {
        this.unhighlightColumn(oArgs.target);
    },

    /**
     * Custom event handler to manage selection according to desktop paradigm.
     *
     * @method onEventSelectRow
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventSelectRow : function(oArgs) {
        var sMode = this.get("selectionMode");
        if(sMode == "single") {
            this._handleSingleSelectionByMouse(oArgs);
        }
        else {
            this._handleStandardSelectionByMouse(oArgs);
        }
    },

    /**
     * Custom event handler to select cell.
     *
     * @method onEventSelectCell
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventSelectCell : function(oArgs) {
        var sMode = this.get("selectionMode");
        if(sMode == "cellblock") {
            this._handleCellBlockSelectionByMouse(oArgs);
        }
        else if(sMode == "cellrange") {
            this._handleCellRangeSelectionByMouse(oArgs);
        }
        else {
            this._handleSingleCellSelectionByMouse(oArgs);
        }
    },

    /**
     * Custom event handler to highlight row. Accounts for spurious
     * caused-by-child events.
     *
     * @method onEventHighlightRow
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventHighlightRow : function(oArgs) {
        this.highlightRow(oArgs.target);
    },

    /**
     * Custom event handler to unhighlight row. Accounts for spurious
     * caused-by-child events.
     *
     * @method onEventUnhighlightRow
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventUnhighlightRow : function(oArgs) {
        this.unhighlightRow(oArgs.target);
    },

    /**
     * Custom event handler to highlight cell. Accounts for spurious
     * caused-by-child events.
     *
     * @method onEventHighlightCell
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventHighlightCell : function(oArgs) {
        this.highlightCell(oArgs.target);
    },

    /**
     * Custom event handler to unhighlight cell. Accounts for spurious
     * caused-by-child events.
     *
     * @method onEventUnhighlightCell
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventUnhighlightCell : function(oArgs) {
        this.unhighlightCell(oArgs.target);
    },

    /**
     * Custom event handler to format cell.
     *
     * @method onEventFormatCell
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventFormatCell : function(oArgs) {
        var target = oArgs.target;

        var elCell = this.getTdEl(target);
        if(elCell) {
            var oColumn = this.getColumn(this.getCellIndex(elCell));
            this.formatCell(elCell.firstChild, this.getRecord(elCell), oColumn);
        }
        else {
            YAHOO.log("Could not format cell " + target, "warn", this.toString());
        }
    },

    /**
     * Custom event handler to edit cell.
     *
     * @method onEventShowCellEditor
     * @param oArgs.event {HTMLEvent} Event object.
     * @param oArgs.target {HTMLElement} Target element.
     */
    onEventShowCellEditor : function(oArgs) {
        if(!this.isDisabled()) {
            this.showCellEditor(oArgs.target);
        }
    },

    /**
     * Custom event handler to save active CellEditor input.
     *
     * @method onEventSaveCellEditor
     */
    onEventSaveCellEditor : function(oArgs) {
        if(this._oCellEditor) {
            if(this._oCellEditor.save) {
                this._oCellEditor.save();
            }
            // Backward compatibility
            else {
                this.saveCellEditor();
            }
        }
    },

    /**
     * Custom event handler to cancel active CellEditor.
     *
     * @method onEventCancelCellEditor
     */
    onEventCancelCellEditor : function(oArgs) {
        if(this._oCellEditor) {
            if(this._oCellEditor.cancel) {
                this._oCellEditor.cancel();
            }
            // Backward compatibility
            else {
                this.cancelCellEditor();
            }
        }
    },

    /**
     * Callback function receives data from DataSource and populates an entire
     * DataTable with Records and TR elements, clearing previous Records, if any.
     *
     * @method onDataReturnInitializeTable
     * @param sRequest {String} Original request.
     * @param oResponse {Object} <a href="http://developer.yahoo.com/yui/datasource/#ds_oParsedResponse">Response object</a>.
     * @param oPayload {MIXED} (optional) Additional argument(s)
     */
    onDataReturnInitializeTable : function(sRequest, oResponse, oPayload) {
        if((this instanceof DT) && this._sId) {
            this.initializeTable();

            this.onDataReturnSetRows(sRequest,oResponse,oPayload);
        }
    },

    /**
     * Callback function receives reponse from DataSource, replaces all existing
     * Records in  RecordSet, updates TR elements with new data, and updates state
     * UI for pagination and sorting from payload data, if necessary.
     *
     * @method onDataReturnReplaceRows
     * @param oRequest {MIXED} Original generated request.
     * @param oResponse {Object} <a href="http://developer.yahoo.com/yui/datasource/#ds_oParsedResponse">Response object</a>.
     * @param oPayload {MIXED} (optional) Additional argument(s)
     */
    onDataReturnReplaceRows : function(oRequest, oResponse, oPayload) {
        if((this instanceof DT) && this._sId) {
            this.fireEvent("dataReturnEvent", {request:oRequest,response:oResponse,payload:oPayload});

            // Pass data through abstract method for any transformations
            var ok    = this.doBeforeLoadData(oRequest, oResponse, oPayload),
                pag   = this.get('paginator'),
                index = 0;

            // Data ok to set
            if(ok && oResponse && !oResponse.error && lang.isArray(oResponse.results)) {
                // Update Records
                this._oRecordSet.reset();

                if (this.get('dynamicData')) {
                    if (oPayload && oPayload.pagination &&
                        lang.isNumber(oPayload.pagination.recordOffset)) {
                        index = oPayload.pagination.recordOffset;
                    } else if (pag) {
                        index = pag.getStartIndex();
                    }
                }

                this._oRecordSet.setRecords(oResponse.results, index | 0);

                // Update state
                this._handleDataReturnPayload(oRequest, oResponse, oPayload);

                // Update UI
                this.render();
            }
            // Error
            else if(ok && oResponse.error) {
                this.showTableMessage(this.get("MSG_ERROR"), DT.CLASS_ERROR);
            }
        }
    },

    /**
     * Callback function receives data from DataSource and appends to an existing
     * DataTable new Records and, if applicable, creates or updates
     * corresponding TR elements.
     *
     * @method onDataReturnAppendRows
     * @param sRequest {String} Original request.
     * @param oResponse {Object} <a href="http://developer.yahoo.com/yui/datasource/#ds_oParsedResponse">Response object</a>.
     * @param oPayload {MIXED} (optional) Additional argument(s)
     */
    onDataReturnAppendRows : function(sRequest, oResponse, oPayload) {
        if((this instanceof DT) && this._sId) {
            this.fireEvent("dataReturnEvent", {request:sRequest,response:oResponse,payload:oPayload});

            // Pass data through abstract method for any transformations
            var ok = this.doBeforeLoadData(sRequest, oResponse, oPayload);

            // Data ok to append
            if(ok && oResponse && !oResponse.error && lang.isArray(oResponse.results)) {
                // Append rows
                this.addRows(oResponse.results);

                // Update state
                this._handleDataReturnPayload(sRequest, oResponse, oPayload);
            }
            // Error
            else if(ok && oResponse.error) {
                this.showTableMessage(this.get("MSG_ERROR"), DT.CLASS_ERROR);
            }
        }
    },

    /**
     * Callback function receives data from DataSource and inserts new records
     * starting at the index specified in oPayload.insertIndex. The value for
     * oPayload.insertIndex can be populated when sending the request to the DataSource,
     * or by accessing oPayload.insertIndex with the doBeforeLoadData() method at runtime.
     * If applicable, creates or updates corresponding TR elements.
     *
     * @method onDataReturnInsertRows
     * @param sRequest {String} Original request.
     * @param oResponse {Object} <a href="http://developer.yahoo.com/yui/datasource/#ds_oParsedResponse">Response object</a>.
     * @param oPayload {MIXED} Argument payload, looks in oPayload.insertIndex.
     */
    onDataReturnInsertRows : function(sRequest, oResponse, oPayload) {
        if((this instanceof DT) && this._sId) {
            this.fireEvent("dataReturnEvent", {request:sRequest,response:oResponse,payload:oPayload});

            // Pass data through abstract method for any transformations
            var ok = this.doBeforeLoadData(sRequest, oResponse, oPayload);

            // Data ok to append
            if(ok && oResponse && !oResponse.error && lang.isArray(oResponse.results)) {
                // Insert rows
                this.addRows(oResponse.results, (oPayload ? oPayload.insertIndex : 0));

                // Update state
                this._handleDataReturnPayload(sRequest, oResponse, oPayload);
            }
            // Error
            else if(ok && oResponse.error) {
                this.showTableMessage(this.get("MSG_ERROR"), DT.CLASS_ERROR);
            }
        }
    },

    /**
     * Callback function receives data from DataSource and incrementally updates Records
     * starting at the index specified in oPayload.updateIndex. The value for
     * oPayload.updateIndex can be populated when sending the request to the DataSource,
     * or by accessing oPayload.updateIndex with the doBeforeLoadData() method at runtime.
     * If applicable, creates or updates corresponding TR elements.
     *
     * @method onDataReturnUpdateRows
     * @param sRequest {String} Original request.
     * @param oResponse {Object} <a href="http://developer.yahoo.com/yui/datasource/#ds_oParsedResponse">Response object</a>.
     * @param oPayload {MIXED} Argument payload, looks in oPayload.updateIndex.
     */
    onDataReturnUpdateRows : function(sRequest, oResponse, oPayload) {
        if((this instanceof DT) && this._sId) {
            this.fireEvent("dataReturnEvent", {request:sRequest,response:oResponse,payload:oPayload});

            // Pass data through abstract method for any transformations
            var ok = this.doBeforeLoadData(sRequest, oResponse, oPayload);

            // Data ok to append
            if(ok && oResponse && !oResponse.error && lang.isArray(oResponse.results)) {
                // Insert rows
                this.updateRows((oPayload ? oPayload.updateIndex : 0), oResponse.results);

                // Update state
                this._handleDataReturnPayload(sRequest, oResponse, oPayload);
            }
            // Error
            else if(ok && oResponse.error) {
                this.showTableMessage(this.get("MSG_ERROR"), DT.CLASS_ERROR);
            }
        }
    },

    /**
     * Callback function receives reponse from DataSource and populates the
     * RecordSet with the results.
     *
     * @method onDataReturnSetRows
     * @param oRequest {MIXED} Original generated request.
     * @param oResponse {Object} <a href="http://developer.yahoo.com/yui/datasource/#ds_oParsedResponse">Response object</a>.
     * @param oPayload {MIXED} (optional) Additional argument(s)
     */
    onDataReturnSetRows : function(oRequest, oResponse, oPayload) {
        if((this instanceof DT) && this._sId) {
            this.fireEvent("dataReturnEvent", {request:oRequest,response:oResponse,payload:oPayload});

            // Pass data through abstract method for any transformations
            var ok    = this.doBeforeLoadData(oRequest, oResponse, oPayload),
                pag   = this.get('paginator'),
                index = 0;

            // Data ok to set
            if(ok && oResponse && !oResponse.error && lang.isArray(oResponse.results)) {
                // Update Records
                if (this.get('dynamicData')) {
                    if (oPayload && oPayload.pagination &&
                        lang.isNumber(oPayload.pagination.recordOffset)) {
                        index = oPayload.pagination.recordOffset;
                    } else if (pag) {
                        index = pag.getStartIndex();
                    }

                    this._oRecordSet.reset(); // Bug 2290604: dyanmic data shouldn't keep accumulating by default
                }

                this._oRecordSet.setRecords(oResponse.results, index | 0);

                // Update state
                this._handleDataReturnPayload(oRequest, oResponse, oPayload);

                // Update UI
                this.render();
            }
            // Error
            else if(ok && oResponse.error) {
                this.showTableMessage(this.get("MSG_ERROR"), DT.CLASS_ERROR);
            }
        }
        else {
            YAHOO.log("Instance destroyed before data returned.","info",this.toString());
        }
    },

    /**
     * Hook to update oPayload before consumption.
     *
     * @method handleDataReturnPayload
     * @param oRequest {MIXED} Original generated request.
     * @param oResponse {Object} <a href="http://developer.yahoo.com/yui/datasource/#ds_oParsedResponse">Response object</a>.
     * @param oPayload {MIXED} State values.
     * @return oPayload {MIXED} State values.
     */
    handleDataReturnPayload : function (oRequest, oResponse, oPayload) {
        return oPayload || {};
    },

    /**
     * Updates the DataTable with state data sent in an onDataReturn* payload.
     *
     * @method _handleDataReturnPayload
     * @param oRequest {MIXED} Original generated request.
     * @param oResponse {Object} <a href="http://developer.yahoo.com/yui/datasource/#ds_oParsedResponse">Response object</a>.
     * @param oPayload {MIXED} State values
     * @private
     */
    _handleDataReturnPayload : function (oRequest, oResponse, oPayload) {
        oPayload = this.handleDataReturnPayload(oRequest, oResponse, oPayload);
        if(oPayload) {
            // Update pagination
            var oPaginator = this.get('paginator');
            if (oPaginator) {
                // Update totalRecords
                if(this.get("dynamicData")) {
                    if (widget.Paginator.isNumeric(oPayload.totalRecords)) {
                        oPaginator.set('totalRecords',oPayload.totalRecords);
                    }
                }
                else {
                    oPaginator.set('totalRecords',this._oRecordSet.getLength());
                }
                // Update other paginator values
                if (lang.isObject(oPayload.pagination)) {
                    oPaginator.set('rowsPerPage',oPayload.pagination.rowsPerPage);
                    oPaginator.set('recordOffset',oPayload.pagination.recordOffset);
                }
            }

            // Update sorting
            if (oPayload.sortedBy) {
                // Set the sorting values in preparation for refresh
                this.set('sortedBy', oPayload.sortedBy);
            }
            // Backwards compatibility for sorting
            else if (oPayload.sorting) {
                // Set the sorting values in preparation for refresh
                this.set('sortedBy', oPayload.sorting);
            }
        }
    },

        /////////////////////////////////////////////////////////////////////////////
        //
        // Custom Events
        //
        /////////////////////////////////////////////////////////////////////////////

        /**
         * Fired when the DataTable's rows are rendered from an initialized state.
         *
         * @event initEvent
         */

        /**
         * Fired before the DataTable's DOM is rendered or modified.
         *
         * @event beforeRenderEvent
         */

        /**
         * Fired when the DataTable's DOM is rendered or modified.
         *
         * @event renderEvent
         */

        /**
         * Fired when the DataTable's post-render routine is complete, including
         * Column width validations.
         *
         * @event postRenderEvent
         */

        /**
         * Fired when the DataTable is disabled.
         *
         * @event disableEvent
         */

        /**
         * Fired when the DataTable is undisabled.
         *
         * @event undisableEvent
         */

        /**
         * Fired when data is returned from DataSource but before it is consumed by
         * DataTable.
         *
         * @event dataReturnEvent
         * @param oArgs.request {String} Original request.
         * @param oArgs.response {Object} Response object.
         */

        /**
         * Fired when the DataTable has a focus event.
         *
         * @event tableFocusEvent
         */

        /**
         * Fired when the DataTable THEAD element has a focus event.
         *
         * @event theadFocusEvent
         */

        /**
         * Fired when the DataTable TBODY element has a focus event.
         *
         * @event tbodyFocusEvent
         */

        /**
         * Fired when the DataTable has a blur event.
         *
         * @event tableBlurEvent
         */

        /*TODO implement theadBlurEvent
         * Fired when the DataTable THEAD element has a blur event.
         *
         * @event theadBlurEvent
         */

        /*TODO: implement tbodyBlurEvent
         * Fired when the DataTable TBODY element has a blur event.
         *
         * @event tbodyBlurEvent
         */

        /**
         * Fired when the DataTable has a key event.
         *
         * @event tableKeyEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The DataTable's TABLE element.
         */

        /**
         * Fired when the DataTable THEAD element has a key event.
         *
         * @event theadKeyEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The DataTable's TABLE element.
         */

        /**
         * Fired when the DataTable TBODY element has a key event.
         *
         * @event tbodyKeyEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The DataTable's TABLE element.
         */

        /**
         * Fired when the DataTable has a mouseover.
         *
         * @event tableMouseoverEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The DataTable's TABLE element.
         *
         */

        /**
         * Fired when the DataTable has a mouseout.
         *
         * @event tableMouseoutEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The DataTable's TABLE element.
         *
         */

        /**
         * Fired when the DataTable has a mousedown.
         *
         * @event tableMousedownEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The DataTable's TABLE element.
         *
         */

        /**
         * Fired when the DataTable has a mouseup.
         *
         * @event tableMouseupEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The DataTable's TABLE element.
         *
         */

        /**
         * Fired when the DataTable has a click.
         *
         * @event tableClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The DataTable's TABLE element.
         *
         */

        /**
         * Fired when the DataTable has a dblclick.
         *
         * @event tableDblclickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The DataTable's TABLE element.
         *
         */

        /**
         * Fired when a message is shown in the DataTable's message element.
         *
         * @event tableMsgShowEvent
         * @param oArgs.html {HTML} The HTML displayed.
         * @param oArgs.className {String} The className assigned.
         *
         */

        /**
         * Fired when the DataTable's message element is hidden.
         *
         * @event tableMsgHideEvent
         */

        /**
         * Fired when a THEAD row has a mouseover.
         *
         * @event theadRowMouseoverEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a THEAD row has a mouseout.
         *
         * @event theadRowMouseoutEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a THEAD row has a mousedown.
         *
         * @event theadRowMousedownEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a THEAD row has a mouseup.
         *
         * @event theadRowMouseupEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a THEAD row has a click.
         *
         * @event theadRowClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a THEAD row has a dblclick.
         *
         * @event theadRowDblclickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a THEAD cell has a mouseover.
         *
         * @event theadCellMouseoverEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TH element.
         *
         */

        /**
         * Fired when a THEAD cell has a mouseout.
         *
         * @event theadCellMouseoutEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TH element.
         *
         */

        /**
         * Fired when a THEAD cell has a mousedown.
         *
         * @event theadCellMousedownEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TH element.
         */

        /**
         * Fired when a THEAD cell has a mouseup.
         *
         * @event theadCellMouseupEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TH element.
         */

        /**
         * Fired when a THEAD cell has a click.
         *
         * @event theadCellClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TH element.
         */

        /**
         * Fired when a THEAD cell has a dblclick.
         *
         * @event theadCellDblclickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TH element.
         */

        /**
         * Fired when a THEAD label has a mouseover.
         *
         * @event theadLabelMouseoverEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The SPAN element.
         *
         */

        /**
         * Fired when a THEAD label has a mouseout.
         *
         * @event theadLabelMouseoutEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The SPAN element.
         *
         */

        /**
         * Fired when a THEAD label has a mousedown.
         *
         * @event theadLabelMousedownEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The SPAN element.
         */

        /**
         * Fired when a THEAD label has a mouseup.
         *
         * @event theadLabelMouseupEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The SPAN element.
         */

        /**
         * Fired when a THEAD label has a click.
         *
         * @event theadLabelClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The SPAN element.
         */

        /**
         * Fired when a THEAD label has a dblclick.
         *
         * @event theadLabelDblclickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The SPAN element.
         */

        /**
         * Fired when a column is sorted.
         *
         * @event columnSortEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         * @param oArgs.dir {String} Sort direction: YAHOO.widget.DataTable.CLASS_ASC
         * or YAHOO.widget.DataTable.CLASS_DESC.
         */

        /**
         * Fired when a column width is set.
         *
         * @event columnSetWidthEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         * @param oArgs.width {Number} The width in pixels.
         */

        /**
         * Fired when a column width is unset.
         *
         * @event columnUnsetWidthEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         */

        /**
         * Fired when a column is drag-resized.
         *
         * @event columnResizeEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         * @param oArgs.target {HTMLElement} The TH element.
         * @param oArgs.width {Number} Width in pixels.
         */

        /**
         * Fired when a Column is moved to a new index.
         *
         * @event columnReorderEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         * @param oArgs.oldIndex {Number} The previous tree index position.
         */

        /**
         * Fired when a column is hidden.
         *
         * @event columnHideEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         */

        /**
         * Fired when a column is shown.
         *
         * @event columnShowEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         */

        /**
         * Fired when a column is selected.
         *
         * @event columnSelectEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         */

        /**
         * Fired when a column is unselected.
         *
         * @event columnUnselectEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         */
        /**
         * Fired when a column is removed.
         *
         * @event columnRemoveEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         */

        /**
         * Fired when a column is inserted.
         *
         * @event columnInsertEvent
         * @param oArgs.column {YAHOO.widget.Column} The Column instance.
         * @param oArgs.index {Number} The index position.
         */

        /**
         * Fired when a column is highlighted.
         *
         * @event columnHighlightEvent
         * @param oArgs.column {YAHOO.widget.Column} The highlighted Column.
         */

        /**
         * Fired when a column is unhighlighted.
         *
         * @event columnUnhighlightEvent
         * @param oArgs.column {YAHOO.widget.Column} The unhighlighted Column.
         */

        /**
         * Fired when a row has a mouseover.
         *
         * @event rowMouseoverEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a row has a mouseout.
         *
         * @event rowMouseoutEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a row has a mousedown.
         *
         * @event rowMousedownEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a row has a mouseup.
         *
         * @event rowMouseupEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a row has a click.
         *
         * @event rowClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a row has a dblclick.
         *
         * @event rowDblclickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TR element.
         */

        /**
         * Fired when a row is added.
         *
         * @event rowAddEvent
         * @param oArgs.record {YAHOO.widget.Record} The added Record.
         */

        /**
         * Fired when rows are added.
         *
         * @event rowsAddEvent
         * @param oArgs.record {YAHOO.widget.Record[]} The added Records.
         */

        /**
         * Fired when a row is updated.
         *
         * @event rowUpdateEvent
         * @param oArgs.record {YAHOO.widget.Record} The updated Record.
         * @param oArgs.oldData {Object} Object literal of the old data.
         */

        /**
         * Fired when a row is deleted.
         *
         * @event rowDeleteEvent
         * @param oArgs.oldData {Object} Object literal of the deleted data.
         * @param oArgs.recordIndex {Number} Index of the deleted Record.
         * @param oArgs.trElIndex {Number} Index of the deleted TR element, if on current page.
         */

        /**
         * Fired when rows are deleted.
         *
         * @event rowsDeleteEvent
         * @param oArgs.oldData {Object[]} Array of object literals of the deleted data.
         * @param oArgs.recordIndex {Number} Index of the first deleted Record.
         * @param oArgs.count {Number} Number of deleted Records.
         */

        /**
         * Fired when a row is selected.
         *
         * @event rowSelectEvent
         * @param oArgs.el {HTMLElement} The selected TR element, if applicable.
         * @param oArgs.record {YAHOO.widget.Record} The selected Record.
         */

        /**
         * Fired when a row is unselected.
         *
         * @event rowUnselectEvent
         * @param oArgs.el {HTMLElement} The unselected TR element, if applicable.
         * @param oArgs.record {YAHOO.widget.Record} The unselected Record.
         */

        /**
         * Fired when all row selections are cleared.
         *
         * @event unselectAllRowsEvent
         */

        /**
         * Fired when a row is highlighted.
         *
         * @event rowHighlightEvent
         * @param oArgs.el {HTMLElement} The highlighted TR element.
         * @param oArgs.record {YAHOO.widget.Record} The highlighted Record.
         */

        /**
         * Fired when a row is unhighlighted.
         *
         * @event rowUnhighlightEvent
         * @param oArgs.el {HTMLElement} The highlighted TR element.
         * @param oArgs.record {YAHOO.widget.Record} The highlighted Record.
         */

        /**
         * Fired when a cell is updated.
         *
         * @event cellUpdateEvent
         * @param oArgs.record {YAHOO.widget.Record} The updated Record.
         * @param oArgs.column {YAHOO.widget.Column} The updated Column.
         * @param oArgs.oldData {Object} Original data value of the updated cell.
         */

        /**
         * Fired when a cell has a mouseover.
         *
         * @event cellMouseoverEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TD element.
         */

        /**
         * Fired when a cell has a mouseout.
         *
         * @event cellMouseoutEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TD element.
         */

        /**
         * Fired when a cell has a mousedown.
         *
         * @event cellMousedownEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TD element.
         */

        /**
         * Fired when a cell has a mouseup.
         *
         * @event cellMouseupEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TD element.
         */

        /**
         * Fired when a cell has a click.
         *
         * @event cellClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TD element.
         */

        /**
         * Fired when a cell has a dblclick.
         *
         * @event cellDblclickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The TD element.
         */

        /**
         * Fired when a cell is formatted.
         *
         * @event cellFormatEvent
         * @param oArgs.el {HTMLElement} The formatted TD element.
         * @param oArgs.record {YAHOO.widget.Record} The associated Record instance.
         * @param oArgs.column {YAHOO.widget.Column} The associated Column instance.
         * @param oArgs.key {String} (deprecated) The key of the formatted cell.
         */

        /**
         * Fired when a cell is selected.
         *
         * @event cellSelectEvent
         * @param oArgs.el {HTMLElement} The selected TD element.
         * @param oArgs.record {YAHOO.widget.Record} The associated Record instance.
         * @param oArgs.column {YAHOO.widget.Column} The associated Column instance.
         * @param oArgs.key {String} (deprecated) The key of the selected cell.
         */

        /**
         * Fired when a cell is unselected.
         *
         * @event cellUnselectEvent
         * @param oArgs.el {HTMLElement} The unselected TD element.
         * @param oArgs.record {YAHOO.widget.Record} The associated Record.
         * @param oArgs.column {YAHOO.widget.Column} The associated Column instance.
         * @param oArgs.key {String} (deprecated) The key of the unselected cell.

         */

        /**
         * Fired when a cell is highlighted.
         *
         * @event cellHighlightEvent
         * @param oArgs.el {HTMLElement} The highlighted TD element.
         * @param oArgs.record {YAHOO.widget.Record} The associated Record instance.
         * @param oArgs.column {YAHOO.widget.Column} The associated Column instance.
         * @param oArgs.key {String} (deprecated) The key of the highlighted cell.

         */

        /**
         * Fired when a cell is unhighlighted.
         *
         * @event cellUnhighlightEvent
         * @param oArgs.el {HTMLElement} The unhighlighted TD element.
         * @param oArgs.record {YAHOO.widget.Record} The associated Record instance.
         * @param oArgs.column {YAHOO.widget.Column} The associated Column instance.
         * @param oArgs.key {String} (deprecated) The key of the unhighlighted cell.

         */

        /**
         * Fired when all cell selections are cleared.
         *
         * @event unselectAllCellsEvent
         */

        /**
         * Fired when a CellEditor is shown.
         *
         * @event editorShowEvent
         * @param oArgs.editor {YAHOO.widget.CellEditor} The CellEditor instance.
         */

        /**
         * Fired when a CellEditor has a keydown.
         *
         * @event editorKeydownEvent
         * @param oArgs.editor {YAHOO.widget.CellEditor} The CellEditor instance.
         * @param oArgs.event {HTMLEvent} The event object.
         */

        /**
         * Fired when a CellEditor input is reverted.
         *
         * @event editorRevertEvent
         * @param oArgs.editor {YAHOO.widget.CellEditor} The CellEditor instance.
         * @param oArgs.newData {Object} New data value from form input field.
         * @param oArgs.oldData {Object} Old data value.
         */

        /**
         * Fired when a CellEditor input is saved.
         *
         * @event editorSaveEvent
         * @param oArgs.editor {YAHOO.widget.CellEditor} The CellEditor instance.
         * @param oArgs.newData {Object} New data value from form input field.
         * @param oArgs.oldData {Object} Old data value.
         */

        /**
         * Fired when a CellEditor input is canceled.
         *
         * @event editorCancelEvent
         * @param oArgs.editor {YAHOO.widget.CellEditor} The CellEditor instance.
         */

        /**
         * Fired when a CellEditor has a blur event.
         *
         * @event editorBlurEvent
         * @param oArgs.editor {YAHOO.widget.CellEditor} The CellEditor instance.
         */

        /**
         * Fired when a CellEditor is blocked.
         *
         * @event editorBlockEvent
         * @param oArgs.editor {YAHOO.widget.CellEditor} The CellEditor instance.
         */

        /**
         * Fired when a CellEditor is unblocked.
         *
         * @event editorUnblockEvent
         * @param oArgs.editor {YAHOO.widget.CellEditor} The CellEditor instance.
         */

        /**
         * Fired when a link is clicked.
         *
         * @event linkClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The A element.
         */

        /**
         * Fired when a BUTTON element or INPUT element of type "button", "image",
         * "submit", "reset" is clicked.
         *
         * @event buttonClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The BUTTON element.
         */

        /**
         * Fired when a CHECKBOX element is clicked.
         *
         * @event checkboxClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The CHECKBOX element.
         */

        /**
         * Fired when a SELECT element is changed.
         *
         * @event dropdownChangeEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The SELECT element.
         */

        /**
         * Fired when a RADIO element is clicked.
         *
         * @event radioClickEvent
         * @param oArgs.event {HTMLEvent} The event object.
         * @param oArgs.target {HTMLElement} The RADIO element.
         */

    /////////////////////////////////////////////////////////////////////////////
    //
    // Deprecated APIs
    //
    /////////////////////////////////////////////////////////////////////////////

    /*
     * @method showCellEditorBtns
     * @deprecated Use CellEditor.renderBtns()
     */
    showCellEditorBtns : function(elContainer) {
        // Buttons
        var elBtnsDiv = elContainer.appendChild(document.createElement("div"));
        Dom.addClass(elBtnsDiv, DT.CLASS_BUTTON);

        // Save button
        var elSaveBtn = elBtnsDiv.appendChild(document.createElement("button"));
        Dom.addClass(elSaveBtn, DT.CLASS_DEFAULT);
        elSaveBtn.innerHTML = "OK";
        Ev.addListener(elSaveBtn, "click", function(oArgs, oSelf) {
            oSelf.onEventSaveCellEditor(oArgs, oSelf);
            oSelf.focusTbodyEl();
        }, this, true);

        // Cancel button
        var elCancelBtn = elBtnsDiv.appendChild(document.createElement("button"));
        elCancelBtn.innerHTML = "Cancel";
        Ev.addListener(elCancelBtn, "click", function(oArgs, oSelf) {
            oSelf.onEventCancelCellEditor(oArgs, oSelf);
            oSelf.focusTbodyEl();
        }, this, true);

        YAHOO.log("The method showCellEditorBtns() has been deprecated." +
                " Please use the CellEditor class.", "warn", this.toString());
    },

    /**
     * @method resetCellEditor
     * @deprecated Use destroyCellEditor
     */
    resetCellEditor : function() {
        var elContainer = this._oCellEditor.container;
        elContainer.style.display = "none";
        Ev.purgeElement(elContainer, true);
        elContainer.innerHTML = "";
        this._oCellEditor.value = null;
        this._oCellEditor.isActive = false;

        YAHOO.log("The method resetCellEditor() has been deprecated." +
                " Please use the CellEditor class.", "warn", this.toString());
    },

    /**
     * @event editorUpdateEvent
     * @deprecated Use CellEditor class.
     */

    /**
     * @method getBody
     * @deprecated Use getTbodyEl().
     */
    getBody : function() {
        // Backward compatibility
        YAHOO.log("The method getBody() has been deprecated" +
                " in favor of getTbodyEl()", "warn", this.toString());
        return this.getTbodyEl();
    },

    /**
     * @method getCell
     * @deprecated Use getTdEl().
     */
    getCell : function(index) {
        // Backward compatibility
        YAHOO.log("The method getCell() has been deprecated" +
                " in favor of getTdEl()", "warn", this.toString());
        return this.getTdEl(index);
    },

    /**
     * @method getRow
     * @deprecated Use getTrEl().
     */
    getRow : function(index) {
        // Backward compatibility
        YAHOO.log("The method getRow() has been deprecated" +
                " in favor of getTrEl()", "warn", this.toString());
        return this.getTrEl(index);
    },

    /**
     * @method refreshView
     * @deprecated Use render.
     */
    refreshView : function() {
        // Backward compatibility
        YAHOO.log("The method refreshView() has been deprecated" +
                " in favor of render()", "warn", this.toString());
        this.render();
    },

    /**
     * @method select
     * @deprecated Use selectRow.
     */
    select : function(els) {
        // Backward compatibility
        YAHOO.log("The method select() has been deprecated" +
                " in favor of selectRow()", "warn", this.toString());
        if(!lang.isArray(els)) {
            els = [els];
        }
        for(var i=0; i<els.length; i++) {
            this.selectRow(els[i]);
        }
    },

    /**
     * @method onEventEditCell
     * @deprecated Use onEventShowCellEditor.
     */
    onEventEditCell : function(oArgs) {
        // Backward compatibility
        YAHOO.log("The method onEventEditCell() has been deprecated" +
            " in favor of onEventShowCellEditor()", "warn", this.toString());
        this.onEventShowCellEditor(oArgs);
    },

    /**
     * @method _syncColWidths
     * @deprecated Use validateColumnWidths.
     */
    _syncColWidths : function() {
        // Backward compatibility
        YAHOO.log("The method _syncColWidths() has been deprecated" +
            " in favor of validateColumnWidths()", "warn", this.toString());
        this.validateColumnWidths();
    }

    /**
     * @event headerRowMouseoverEvent
     * @deprecated Use theadRowMouseoverEvent.
     */

    /**
     * @event headerRowMouseoutEvent
     * @deprecated Use theadRowMouseoutEvent.
     */

    /**
     * @event headerRowMousedownEvent
     * @deprecated Use theadRowMousedownEvent.
     */

    /**
     * @event headerRowClickEvent
     * @deprecated Use theadRowClickEvent.
     */

    /**
     * @event headerRowDblclickEvent
     * @deprecated Use theadRowDblclickEvent.
     */

    /**
     * @event headerCellMouseoverEvent
     * @deprecated Use theadCellMouseoverEvent.
     */

    /**
     * @event headerCellMouseoutEvent
     * @deprecated Use theadCellMouseoutEvent.
     */

    /**
     * @event headerCellMousedownEvent
     * @deprecated Use theadCellMousedownEvent.
     */

    /**
     * @event headerCellClickEvent
     * @deprecated Use theadCellClickEvent.
     */

    /**
     * @event headerCellDblclickEvent
     * @deprecated Use theadCellDblclickEvent.
     */

    /**
     * @event headerLabelMouseoverEvent
     * @deprecated Use theadLabelMouseoverEvent.
     */

    /**
     * @event headerLabelMouseoutEvent
     * @deprecated Use theadLabelMouseoutEvent.
     */

    /**
     * @event headerLabelMousedownEvent
     * @deprecated Use theadLabelMousedownEvent.
     */

    /**
     * @event headerLabelClickEvent
     * @deprecated Use theadLabelClickEvent.
     */

    /**
     * @event headerLabelDbllickEvent
     * @deprecated Use theadLabelDblclickEvent.
     */

    });

    /**
     * Alias for onDataReturnSetRows for backward compatibility
     * @method onDataReturnSetRecords
     * @deprecated Use onDataReturnSetRows
     */
    DT.prototype.onDataReturnSetRecords = DT.prototype.onDataReturnSetRows;

    /**
     * Alias for onPaginatorChange for backward compatibility
     * @method onPaginatorChange
     * @deprecated Use onPaginatorChangeRequest
     */
    DT.prototype.onPaginatorChange = DT.prototype.onPaginatorChangeRequest;

    /////////////////////////////////////////////////////////////////////////////
    //
    // Deprecated static APIs
    //
    /////////////////////////////////////////////////////////////////////////////
    /**
     * @method DataTable.editCheckbox
     * @deprecated  Use YAHOO.widget.CheckboxCellEditor.
     */
    DT.editCheckbox = function() {};

    /**
     * @method DataTable.editDate
     * @deprecated Use YAHOO.widget.DateCellEditor.
     */
    DT.editDate = function() {};

    /**
     * @method DataTable.editDropdown
     * @deprecated Use YAHOO.widget.DropdownCellEditor.
     */
    DT.editDropdown = function() {};

    /**
     * @method DataTable.editRadio
     * @deprecated Use YAHOO.widget.RadioCellEditor.
     */
    DT.editRadio = function() {};

    /**
     * @method DataTable.editTextarea
     * @deprecated Use YAHOO.widget.TextareaCellEditor
     */
    DT.editTextarea = function() {};

    /**
     * @method DataTable.editTextbox
     * @deprecated Use YAHOO.widget.TextboxCellEditor
     */
    DT.editTextbox= function() {};

    })();

Copyright © 2011 Yahoo! Inc. All rights reserved.