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