Javascript image swap with link

[sakocreative]

I currently have a photo gallery with thumbnails and one larger image. The javascript allows the larger image to change according to which thumbnail is clicked. I need to add a link on the larger image (to go to a new URL) but am not having any luck finding a new javascript or modifying my current script. You can check out my gallery to see what I mean, www.sakocreative.com/id.php (http://www.sakocreative.com/id.php).
I don't need anything like lightbox, just a link to go out to a new URL via a new window.

Any suggestions/help would be great.

Thanks,
Stacey