sfHover = function() {
    if (document.getElementById("navbar") != null) {
        var sfEls = document.getElementById("navbar").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);