Resizable table columns

HTML

<div>
    <table class="resizable">
        <colgroup>
            <col style="width: 100px"/>
            <col style="width: 150px"/>
            <col style="width: 100px"/>
            <col style="width: 100px"/>
            <col style="width: 100px"/>
            <col style="width: 100px"/>
        </colgroup>
        <thead>
            <tr>
                <th>
                    <span class="columnLabel">Column 1</span>
                    <div class="resizeHelper ui-resizable-handle ui-resizable-e">&nbsp;</div>
                </th>
                <th>
                    <span class="columnLabel">Column 2</span>
                    <div class="resizeHelper ui-resizable-handle ui-resizable-e">&nbsp;</div>
                </th>
                <th>
                    <span class="columnLabel">Column 3</span>
                    <div class="resizeHelper ui-resizable-handle ui-resizable-e">&nbsp;</div>
                </th>
                <th>
                    <span class="columnLabel">Column 4</span>
                    <div class="resizeHelper ui-resizable-handle ui-resizable-e">&nbsp;</div>
                </th>
                <th>
                    <span class="columnLabel">Column 5</span>
                    <div class="resizeHelper ui-resizable-handle ui-resizable-e">&nbsp;</div>
                </th>
                <th>
                    <span class="columnLabel">Column 6</span>
                    <div class="resizeHelper ui-resizable-handle ui-resizable-e">&nbsp;</div>
                </th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>Row 1</td>
                <td>Column 2</td>
                <td>Column 3</td>
                <td>Column 4</td>
                <td>Column 5</td>
                <td>Column 6</td>
            </tr>
            <tr>
                <td>Row 2</td>
                <td>Column 2</td>
                <td>Column 3</td>
                <td>Column 4</td>
               ...

CSS

th {
    border-right: 1px solid black;
}

/*
resizable columns
*/

JavaScript

/**
 * enables resizable data table columns.
 * Script by Ingo Hofmann
 */
(function($) {

    /**
     * Widget makes columns of a table resizable.
     */
    $.widget("ih.resizableColumns", {

        /**
         * initializing columns
         */
        _create: function() {
            this._initResizable();
        },

        /**
         * init jQuery UI sortable
         */
        _initResizable: function() {

            var colElement, colWidth, originalSize;
            var table = this.element;

            this.element.find("th").resizable({
                // use existing DIV rather than creating new nodes
                handles: {
                    "e": " .resizeHelper"
                },
   
                // default min width in case there is no label
                minWidth: 10,
                
                // set min-width to label size
                create: function(event, ui) {
                    var minWidth = $(this).find(".columnLabel").width();
                    if (minWidth) {
                        
                        // FF cannot handle absolute resizable helper
                        /*if ($.browser.mozilla) {
                            minWidth += $(this).find(".ui-resizable-e").width();
                        }*/
                        minWidth += $(this).find(".ui-resizable-e").width();
                        
                        $(this).resizable("option", "minWidth", minWidth);
                    }
                },

                // set correct COL element and original size
                start: function(event, ui) {
                    var colIndex = ui.helper.index() + 1;
                    colElement = table.find("colgroup > col:nth-child(" + colIndex + ")");
                    colWidth = parseInt(colElement.get(0).style.width, 10); // faster than width
                    originalSize = ui.size.width;
                },

                // set COL width
                resize:...