function sfHover() {
	var sfEls = document.getElementById("mainlevel").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 = this.className.replace(new RegExp("sfhover\\b"), "");
			}
	}
}