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

if (window.attachEvent)
  window.attachEvent("onload", startMenu)
else
  window.onload=startMenu;