Help with dreamweaver gallery - or ext. for gallery

This link is to a template that I found that I really love how the gallery looks... but I am trying to figure out how to create this gallery with thumbnails along the top where you can click on one of the thumbnails on the left first (in the mouse over section) to activate which set of thumbnails you see at the top. Then once you click on one of those thumbnails at the top the image changes in the main section along with the extra 2 or 3 images that you can right or left arrow click to.  http://www.templatehelp.com/preset/pr_preview.php?i=20121&pr_code=J3Yh

More info on what I am trying to do. incase that wasn't just jibberish.

The boxes that have the images on the left (which is the mouse over section) I want to be able to click on one of the images for ex they would be listed as performing arts, restaurants, education etc. I would like to be able to click on one then once clicked have a set of thumbnails at the top of the main image that have one thumbnail for each job. so once you click on the job the main image changes to whatever job image I place in there along with still being able to click through more of the same job in that area like it does now.

I am using Dreamweaver CS4... but if you know of an extension that can do that ... that would be great to.

thanks