Popup up in free e-commerce template

[freenicetemplates]

I downloaded one of your template the "Tulip Flowers", and i have been trying to hook up my ZenCart to one of the links but i want the cart to Pop not open a new page! I have tried it but it seems i am at a lost. Can you tell me how can i make the page popup a page from the Links to the left so i can have a popup link? I tried using Lightbox but i keep getting stuck on how to add my link as the Template uses a predefined way of creating links to pages. How do i go about making on of my navigational links to pop a page; the main link buttons? Looking forward to your reply. Thank you.

Innocent Muro

P/s: Currently after reading your forum my cart is opened in another page!