Adding "detail" images, xml gallery

I know, I know. There are about a billion posts about the xml gallery, but I am stuck on one thing. I am using the xml resize gallery (V3 with thumbs). It works great, but I want to load detail images along the main image, and have these images load in the main image pane when clicked. I havent been able to figure out how to add the neccessary code to make this happen. Can anyone point me in the right direction??
Thanks!!
-Wil