function startList(){
  try{
      var navRoot = document.getElementById("nav");

      for(i=0; i<navRoot.childNodes.length; i++)
      {
       node = navRoot.childNodes[i];

       if(node.nodeName == "li" || node.nodeName=="LI"){
        node.onmouseover = function(){
         this.className+="over";
        }
        
        node.onmouseout=function(){
         this.className=this.className.replace("over", "");
        }
       }
      }
    }catch(e){
      alert(e.message)
    }
      
 }
 window.onload=startList;
 function a(){
  alert(1);
 }
 //startList()