// included.js

// 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() { 
  new accordion('main', {
    classNames : {
      toggle   : 'accordion-toggle',
      content  : 'accordion-content'
    }
  });
}