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