sfHover = function() {
  if (!document.getElementsByTagName) return false;
  var sfEls = document.getElementById("pop").getElementsByTagName("li");
  for (var i=0; i<sfEls.length; i++) {
  sfEls[i].onmouseover=function() {
 this.className+=" sfhover";
  }
  sfEls[i].onmouseout=function() {
  this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
  }
  }
  }
  if (window.attachEvent) window.attachEvent("onload", sfHover);