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);