function startMenu(){
 if(document.all&&document.getElementById){
  navmenu=document.getElementById('nav');
  for(i=0;i<navmenu.childNodes.length;i++){
   node=navmenu.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;}