startList = function()
{
    if (document.all&&document.getElementById)
    {
        navRoot = document.getElementById("nav");
        for (i=0; i<navRoot.childNodes.length; i++)
        {
            node = navRoot.childNodes[i];
            if (node.nodeName=="LI")
            {
                node.onmouseover=function() { this.className+=" over"; }
                node.onmouseout=function() { this.className=this.className.replace(" over", ""); }
            }
        }
    }
}

window.onload=startList;