window.addEvent('domready', function() {
    var accordion = new Accordion($$('.toggler'), $$('.element'), {
        opacity: 0,
        alwaysHide: true,
        start: 'all-closed',
        onActive: function(toggler) { toggler.setStyle('background-position', 'right top'); },
        onBackground: function(toggler) { toggler.setStyle('background-position', 'right bottom'); }
    });
});