var myStretch;
var myStretcher;
var myAccordion;
function init() {
myStretcher = document.getElementsByClassName('stretcher');
myStretch = document.getElementsByClassName('tab');
myAccordion = new fx.Accordion(myStretch, myStretcher, {opacity: true, duration: 500});
// Select your default opened section
myAccordion.showThisHideOpen(myStretcher[0],function () {});}