Sub Category image icons suddenly not showing

[Snostar]

I am working on a new site:
http://www.joomla25.meadowsmedical.com/

If you go to online store all of my main categories show as image icons 3 across.  When ou click on one of the main categories it now goes to an empy page where is use to go to another page of image icons for the sub categories.  This happened for ALL the sub category pages, when I have only been working on 1-2.  Could I have deleted something in a css that would affect this?

All help is appreciated!