sfHover = function() {
	var sfEls = document.getElementById('main_menu').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);