Element.observe(document, 'dom:loaded', bindAccordions);
function bindAccordions() {
  $$('.accordions').each(function(el){
    var first, acc = new Accordion(el.identify(), {
      classNames : {
        toggle : 'accordion_toggle',
        toggleActive : 'accordion_toggle_active',
        content : 'accordion_content'
      },
      direction : 'vertical'
    });
    first = el.select('.accordion_toggle').first();
    acc.activate(first);
  });
}