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

var toggles = $$('div[class^=menu-page-item]');
var content = $$('.menu-element');
var ArrActif = $$('.menu-page-item-active');
var idActif = ArrActif[0].get('id');
var Actif = (idActif.substring(5)-1);
var AccordionObject = new Accordion(toggles, content,{display:Actif});
});