Background of products listing page

Hi,
does anyone know how can I "remove" the boxes around the products on a products listing page (for every products listing page of the shop), so that the users can see the background of the page behind the pictures?
To clarify my question my products listing pages are like this:
pervolia.dyndns-server.com/athina-arte/i.../2011-02-09-21-03-46
and I want them to look like this:
pervolia.dyndns-server.com/athina-arte/i...-/category_pathway-0

An inspection with firebug shows that if I remove the line for the background or change "none" with the path to my background picture will do the trick (for that particular page). But I don't know where I should make that change...
#hikashop_category_information_menu_119 div.hikashop_subcontainer {
background: none repeat scroll 0 0 #CCCCCC;
}

Thanks in advance

I can't believe it was that easy!!!
Thanks!!