function InitMenu() {
	//get the nav top lis
	var tabs = $('header').select('.Nav > li');
	
	//set mouseover events
	tabs.each(function(elem, index) {
		elem.observe('mouseover', function() {
			this.addClassName('hover');
		});
		elem.observe('mouseout', function() {
			this.removeClassName('hover');
		});
	});
}

document.observe("dom:loaded", InitMenu);