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;