menuHover = function() {
	var listItems = document.getElementById('menu').getElementsByTagName('LI');
	for(var i=0; i<listItems.length; i++) {
		listItems[i].onmouseover = function() {
			this.className += ' hover';
		}
		listItems[i].onmouseout = function() {
			this.className = this.className.replace(new RegExp("hover\\b"), '');
		}
	}
}

if(window.attachEvent) {
	window.attachEvent('onload', menuHover);
}