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

	//create our Accordion instance
	var myAccordion = new Accordion($('boeken'), 'span.klik', 'div.element', {
		opacity: true,
		display: -1,
		onActive: function(toggler, element){
			toggler.setStyle('display', 'none');
		},
		onBackground: function(toggler, element){
			toggler.setStyle('display', 'inline');
		}
	});

});