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;