jsHover = function() {
  var hEls = document.getElementById("menu").getElementsByTagName("LI");
  for (var i=0, len=hEls.length; i<len; i++) {
    hEls[i].onmouseover=function() { this.className+=" jshover"; }
    hEls[i].onmouseout=function() { this.className=this.className.replace(" jshover", ""); }
  }
}
if (navigator.appVersion.indexOf("MSIE 6")>-1) window.attachEvent("onload", jsHover);