window.addEvent('domready', function(){
	// We are setting the opacity of the element to 0.5 and adding two events
	var el = $$('mod_navigation');

	$$(el, 'li').addEvents({
		mouseenter: function(){
			// This morphes the opacity and backgroundColor
			this.addClass('navHover');
		},
		mouseleave: function(){
			// Morphes back to the original style
			this.removeClass('navHover');
		}
	});

});