[plugin: eShop] Option set in product page

Hi,
i’m studying eShop plugin from 3 days and WP from 2 week.
I thought that was more easy, but with time and patience, i try to understand everything, and this support is very great and helpful.

My question about eShop is to achieve a product, like a T-Shirt, with a color as option set.
I want to show this option, not as drop-down or radio box, but like boxes colored and clickable.
Then i want when user click on box, the product’s color and relative images change (ajax).

I think that to make this i have to write a new template, but i don’t know the functions to use! 🙂

I’ve see this kind of behaviour in this site, listed as eShop site from http://quirm.net/eshop-sites/: http://cybersuicide.com/?page_id=23.

Thanks who can and try to help me! 🙂