Referance:http://jsfiddle.net/Xanetia/8kz4m/
<div class="accordion">
<h2>Level 1:1</h2>
<div class="pane">
<div class="accordion">
<h2>Level 1 : 1</h2>
<div class="pane">
<div class="accordion">
<h2>Set 1</h2>
<div class="pane">
<div class="accordion">
<h2>Test3</h2>
<div class="pane">
<div class="accordion">
[Pane Content]
</div>
</div>
</div>
</div>
</div>
</div>
<h2>Level 1 : 2</h2>
<div class="pane">
<div class="accordion">
<h2>Set 1</h2>
<div class="pane">
<div class="accordion">
<h2>Test3</h2>
<div class=" ...
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