<script type="text/javascript">
            
        //
        //  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 topAccordion = new accordion('horizontal_container', {
                classNames : {
                    toggle : 'horizontal_accordion_toggle',
                    toggleActive : 'horizontal_accordion_toggle_active',
                    content : 'horizontal_accordion_content'
                },
                defaultSize : {
                    width : 525
                },
                direction : 'horizontal'
            });
            
            var bottomAccordion = new accordion('vertical_container');
            
            var nestedVerticalAccordion = new accordion('vertical_nested_container', {
              classNames : {
                    toggle : 'vertical_accordion_toggle',
                    toggleActive : 'vertical_accordion_toggle_active',
                    content : 'vertical_accordion_content'
                }
            });
            
            // Open first one
            bottomAccordion.activate($$('#vertical_container .accordion_toggle')[0]);
            
            // Open second one
            topAccordion.activate($$('#horizontal_container .horizontal_accordion_toggle')[2]);
        }
        
    </script>