sfHover = function() {

	var sfEls = document.getElementById("main-navigation").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);