startList = function() {


if (document.all&&document.getElementById) {
navRoot = document.getElementById("mainmenu").getElementsByTagName("ul")[0];

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;