window.addEvent('domready', function() {
	$$('div.mod_navigation ul li a').each(function(el) {
		//fx
		var fx = new Fx.Tween(el,{
			duration: 500,
			link: 'cancel'
		});
				
		//css & events
		el.setStyle('background-position','0 0px').addEvents({
			'mouseenter': function(e) {
				e.stop();
				fx.start('background-position','0px -33px');
			},
			'mouseleave': function(e) {
				e.stop();
				fx.start('background-position','0px 0px');
			}
		});
	});
});