Discount on varieties of the same item

Here is the relevant page

http://wireyourworld.com/catalog/index.php?main_page=product_info&products_id=28:b35dc6077ed98b2e49b2bac9bf8e52ca

You'll notice I'm offering a discount on 2 or more rings, however zencart only applies this if the 2 rings are added to the cart at the same time, they would have to be the same rings.

I'd like to apply the discount to ANY ring ordered from that listing, where the customer has to add each to the cart separately because they are different sizes, colors, etc.

How do I do that? Do I need to download the Quantity Discount addon or is there a setting already in Zencart that I'm missing?

Please don't post your session IDs, and certainly don't post the same question more than once, as that wastes our time (which is donated for free) when several people start answering the same question in different places.

Pardon me, I wasn't certain if I had posted in the right area.

Whats a session ID and where did I post it?

And kuroi, I don't suppose you can actually answer the question?

I apologise. Looking more closely it turned out not to be a session ID but an extended product ID looking very similar. The session ID is an index used on your site as the link between each page that you view. The risk of publishing it is that if it's still active, a hacker might be able to use it and hijack the session.

I get it, yeah I just copied the link from address bar on my site and I'm not even logged in as a customer so I had no idea what you meant. This is ALL new to me. Ummm, still no answer to my question?