Extra Images in Category Listing

[joshman101]

Hi,

I'm trying to put extra images for a product on the  product category page, but I can't work out how to do this at all. I've uploaded the images to the product but they don't appear and I can't find any setting where I can change this.  The page in question is here.

http://www.rockvilladesigns.com/index.php/products/art

Thanks in advance.

Josh