sfHover = function() {
      var sfEls = document.getElementById("nav").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);