startList = function() 
{
 if (document.all && document.getElementById) 
 {
   var navRoot = {};
  navRoot[0] =document.getElementById("nav");
  navRoot[1] =document.getElementById("nav1");
  navRoot[2] =document.getElementById("nav2");
  navRoot[3] =document.getElementById("nav3");
  navRoot[4] =document.getElementById("nav4");
  navRoot[5] =document.getElementById("nav5");
  for (j=0; j<=5; j++) 
  {
  for (i=0; i<navRoot[j].childNodes.length; i++) 
  {
   node = navRoot[j].childNodes[i];
   if (node.nodeName=="LI") 
   {
    node.onmouseover=function() {  this.className+=" over"; }
    node.onmouseout=function() { this.className=this.className.replace(" over", ""); }
   }
  }
  }
 }
}

window.onload=startList;