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