var collapsedImg = '<img src="/img/icons/collapsed.gif" border="0" alt="Expand" />';
var expandedImg = '<img src="/img/icons/expanded.gif" border="0" alt="Collapse" />';

window.addEvent('domready', function () {
    var myAccordion = new Accordion($('accordion'), 'h3.toggler', 'div.element', {
        opacity: false,
        onActive: function (toggler, element) {
            toggler.setStyle('color', '#fff');
            var lbl = toggler.getElement('label');
            if (lbl) {
                lbl.innerHTML = expandedImg;
            }
        },
        onBackground: function (toggler, element) {
            toggler.setStyle('color', '#fff');
            var lbl = toggler.getElement('label');
            if (lbl) {
                lbl.innerHTML = collapsedImg;
            }
        }
    });
});