sfHover = function() {
	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(/sfhover/g, "");
		}
	}
}
if (window.attachEvent) {
	window.attachEvent("onload", sfHover);
} else {
	window.onload=sfHover;
}