sfHover = function() {
	var sfEls = $$('#nav_menu li');
	sfEls.each(function(e) {
		e.onmouseover = function() { this.addClassName('sfhover'); }
		e.onmouseout = function() { this.removeClassName('sfhover'); }
	});
}

if (window.attachEvent) window.attachEvent("onload", sfHover);