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

window.onload=startList;