function ExpandCollapseTable(titleRow)
    {
        if(titleRow.parentNode.childNodes.length > 1)
        {
             if(titleRow.parentNode.childNodes[1].style.display=="block" || titleRow.parentNode.childNodes[1].style.display=="")
             {
                for(var i=1;i<titleRow.parentNode.childNodes.length;i++)
                {
                    titleRow.parentNode.childNodes[i].style.display = "none";
                }
             }
             else
             {
                for(var i=1;i<titleRow.parentNode.childNodes.length;i++)
                {
                    titleRow.parentNode.childNodes[i].style.display = "block";
                }
             }
        }
    }

------------------------------------------------------------------------
Example :

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Untitled Page</title>
    <script type="text/javascript">
    function ExpandCollapseTable(titleRow)
    {
        if(titleRow.parentNode.childNodes.length > 1)
        {
             if(titleRow.parentNode.childNodes[1].style.display=="block" || titleRow.parentNode.childNodes[1].style.display=="")
             {
                for(var i=1;i<titleRow.parentNode.childNodes.length;i++)
                {
                    titleRow.parentNode.childNodes[i].style.display = "none";
                }
             }
             else
             {
                for(var i=1;i<titleRow.parentNode.childNodes.length;i++)
                {
                    titleRow.parentNode.childNodes[i].style.display = "block";
                }
             }
        }
    }
    </script>
</head>
<body>
    <table border=1>
        <tr onclick="ExpandCollapseTable(this);" style="cursor:pointer;">
        <td colspan=3>
        Table Header(click to expand-collapse)
        </td>
        </tr>
        <tr>
            <td style="width: 100px">
                1</td>
            <td style="width: 100px">
                2</td>
            <td style="width: 100px">
                3</td>
        </tr>
        <tr>
            <td style="width: 100px">
                4</td>
            <td style="width: 100px">
                5</td>
            <td style="width: 100px">
                6</td>
        </tr>
        <tr>
            <td style="width: 100px">
                7</td>
            <td style="width: 100px">
                8</td>
            <td style="width: 100px">
                9</td>
        </tr>
    </table>

</body>
</html>
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