sfHover = function() {
	if (!document.getElementsByTagName) return false;
	var sfEls1 = document.getElementById("topnav").getElementsByTagName("li");

	for (var i=0; i<sfEls1.length; i++) {
		sfEls1[i].onmouseover=function() {
			this.className+=" sfhover1";
		}
		sfEls1[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover1\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);