Hey everyone,
Take a look at this page first:
http://www.sunthingproductions.com/store/pinkfreud.html
You'll see five buttons that say S, M, L, XL, and XXL. I setup a product in my X-Cart inventory for the Pink Freud t-shirt you see, and I added the shirt sizes as product options. By default those options are linked through a drop down menu. How do I link each product option to the respectivee buttons you see in the above link?