Shopping from a list without leaving page question

Hello,

I have a client that would like a cart to display a list of products with pricing and have the ability to add product to the cart, similar to Tesco.com, without leaving the page – as screenshot here:

http://barclayjames.co.uk/client17/ecommerceexamplescreenshot.jpg

Essentially, client doesn’t want the shopper to have to leave the product category page for every small value cart purchase.

Your advice is welcomed.

Callum.

http://wordpress.org/extend/plugins/wp-e-commerce/