Want to add a third div to product page?

This is what I have:

http://www.8legstudio.com/client/discosports/index.php?main_page=product_info&cPath=19_20&products_id=19

This is what I want to have:

http://img46.imageshack.us/img46/4527/previewaccessoriesright.gif

Currently, recommended accessories (ie: x-sell or cross sell) products sit at the very bottom of the site, after ADD TO CART. They aren't recognizable all the way down there.

I want to move them to the right hand side, aligned vertically, one on top of each other.

I assume I need to create a third div but I'm not sure where. I've opened up tpl_main_page but that only controls the actual product content (name, photo, description, attributes, etc). I need to find access to the actual layout of the product page, so I can add in this third div. I just don't know what the file is called.

I've searched in and out of my current template files and need some help.

Once I create this div, I hope to take PHP from cross-sell and move it to the proper column, creating the look I want.