Online Designing

Hello, please can you help.

If you go to the site http://www.coversbyu.com/ and click on the 'Design My Cover' tab you'll see you are able to create your own design. How do they do that? I take it its through ActionScript but how? Also how do they link it to the shopping cart which is then processed all together?

Thanks for your help,

Spu

I think it's:

http://www.swift-tools.com/