Accordion: two in the same document

Accordion: two in the same document

hi, I wish to put 2 accordions in the page.
The problem is that I can't assign the same string for an id.
example:
<div id="accordion">
<h3><a href="#">something</a></h3>
<div>
</div>
<h3><a href="#">something else</a></h3>
<div>
</div>
</div>
..........
<!-- accordion 2-->
<div id="accordion">
<h3><a href="#">another one</a></h3>
<div>
</div>
<h3><a href="#">another one_2</a></h3>
<div>
</div>
</div>
in fact the first accordion is shown correctly but not the second one.
How can avoid the problem?
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