this generates an error in IE:

element.siblings()[ ColumnIndex ];

I am currently using this workaround:

    /**
    * Works in IE.
    * keep this comment to reuse freely:
    * @see http://www.fullposter.com/?1
    */
    function siblings(element)
        {
        // use jquery for FF
        if ( element.siblings )
            return element.siblings();

        // do it manually
        if (typeof element == "string") { element = document.getElementById(element); };
        if (!element) { return null; };
        var siblings = [];
        var elementcopy = element;
        while (elementcopy.previousSibling)
            {
            if (elementcopy.previousSibling.nodeType == 1)
                siblings.unshift(elementcopy.previousSibling);
            elementcopy = elementcopy.previousSibling;
            }
        elementcopy = element;
        while (elementcopy.nextSibling)
            {
            if (elementcopy.nextSibling.nodeType == 1)
                siblings.push(elementcopy.nextSibling);
            elementcopy = elementcopy.nextSibling;
            }

        return siblings;
        }