//we define two arrays, containing our toggles and divs.
var elementStretch = document.getElementById('level1-2');
var elementTrigger = document.getElementById('level1');

//alert(elementStretch);

//then we create the effect.
var myAccordion = new fx.Accordion(elementTrigger, elementStretch, {opacity: true, duration: 500});

window.onLoad(myAccordion.showThisHideOpen(elementStretch[0]));