window.addEvent('domready', function () {

    if (!window.XMLHttpRequest) {
        return;
    }
    else { // ok to continue

        //create our Accordion instance
        var myAccordion = new Accordion($('accordion'), 'h2.toggler', 'div.acc_element', {

            opacity: false,
            onActive: function (toggler, element) {
                toggler.addClass('arrowclose');
                toggler.removeClass('arrowopen');
            },
            onBackground: function (toggler, element) {
                toggler.addClass('arrowopen');
                toggler.removeClass('arrowclose');
            }
        });

    }

});