sfHover = function() {

    var sfEls = document.getElementById("menu").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);