sfHover = function() {
	var sfElements = document.getElementById("nav").getElementsByTagName("li");
	for (var ii=0; ii<sfElements.length; ++ii) {
		sfElements[ii].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfElements[ii].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}