You don't have stylesheet_categories_dressing.css - did you copy the content of that into your main stylesheet? And your categories link classes are not what I would expect to see for a Cat Dressing text link setup. View source shows this
HTML Code:
<div id="categoriesContent" class="sideBoxContent">
<a class="category-top" href="http://www.toys-r-ok.com/index.php?main_page=index&amp;cPath=1">Hardware</a><br />

<a class="category-top" href="
Your template does not have the mod's tpl_categories.php active in it.

Check the actual locations of the files.