I have been working on a vertical accordion but seems not to be working, Can some one please check where the error is?

Thanks in advance;

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


function loadAccordions() {
var verticalAccordions = $$('.accordion_toggle');
verticalAccordions.each(function(accordion) {
$(accordion.next(0)).setStyle({
height: '0px'
});

var Accordion = new accordion('vertical_container');

{
classNames : {
toggle : 'vertical_accordion_toggle',
toggleActive : 'vertical_accordion_toggle_active',
content : 'vertical_accordion_content',
}
});
defaultSize : {
height : null,
width : null
},
direction : 'vertical',

onEvent : 'click'


Accordion.activate($$('#vertical_content .accordion_toggle')[0]);

}

HTML

<div id="Content">
<table width="570px" cellpadding="2" cellspacing="5">
<tr>
<td>
<h2 class="accordion_toggle" align="left">......</h2>
<div class="accordion_content" align="justify">
............................................................
............................................................
</div>
</td>
</tr>
</div>


<script type="text/javascript" >

var verticalAccordions = $$('.accordion_toggle');
verticalAccordions.each(function(accordion) {
$(accordion.next(0)).setStyle({
height: '0px'
});
});


</script>

</body>


Is something wrong with the code or did I miss out sth?