Product Thumbnails - How To Link Them To An Outside Url

I'm using CS cart to sell ready to go websites for business owners. On each product page, there is an option to add a 'thumbnail'. I put a screenshot of the website as a thumbnail and when I click on the thumbnail, it pops up with the larger image -which is great for most applications. However, I would like the website to open in a new tab when someone has clicked the thumbnail. That way they can see the site “LIVE”.

Can this be done with the cart as is? What file would I look at modifying to get this to work or is there already a mod for it that I'm overlooking? I've tried searching the forums to see if anyone else has asked or if a mod is available and I cannot find anything. I would appreciate any direction. Thanks!