var browser = navigator.appName;
var os = navigator.platform;

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", "");
        }
      }
    }
  }
}

if(browser == "Microsoft Internet Explorer" && os != "MacPPC") {
  window.onload=startList;
}