New Post: Structuing of NB store

where I can find the bellow div
<div id="dnn_ctr552_ProductList_pnlProductList">

I want to give a design to the above div and also some other div.That's why I need the total structure of the NB store.

But I can't able to find some of the div structure like:

<div id="dnn_ctr552_ProductList_pnlProductList">
<div class="CategoryMessage"> </div><div class="NBrightWrapperProdCatMenu"> </div><table id="dnn_ctr552_ProductList_dlProductList" class="ProductList11" cellspacing="0" cellpadding="0" style="width:100%;border-collapse:collapse;">
<tbody>

from where this structure is coming?