//  In my case I want to load them onload, this is how you do it!

Event.observe(window, 'load', loadAccordions, false);

//	Set up all accordions

function loadAccordions() {
			
	var verticalAccordion = new accordion('vertical_container_g');
	verticalAccordion.activate($$('#vertical_container_g .accordion_toggle')[0]);
	
}