//the main function, call to the effect object
function init(partie){

	var stretchers = document.getElementsByClassName('stretcher'); //div that stretches
	var togglers = document.getElementsByClassName('display'); //h3s where I click on
	
	var myAccordion = new fx.Accordion(togglers, stretchers, { opacity: true, start: false, 
	
		onActive: function(toggler, i){
			Element.setStyle(toggler, {backgroundImage: 'url(/images/menu_carre_vert.gif)'});
		},
		
		onBackground: function(toggler, i){
			Element.setStyle(toggler, {backgroundImage: 'url(/images/menu_carre_gris.gif)'});
		}
	});
		
	if(partie!=null)myAccordion.showThisHideOpen(partie);
	
}