window.addEvent('domready', function() {   
    var accordion = new Accordion($$('h3.nav_item'),$$('div.nav_sub'), {   
        show: 999999,
	    opacity: 0,   
        onActive: function(toggler) {
	        toggler.setStyle('background', 'url(body/nav_item.jpg) no-repeat');
	        toggler.setStyle('color', '#fff');
	    },
	    onBackground: function(toggler) {
		    toggler.setStyle('background', 'none');
		    toggler.setStyle('color', '#acacac');
		}
    });   
});