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;