need to control gallery table width

Should be an easy fix, I actually had it working, but managed to mess it up somehow.

What I want to do is change the table width from %100 to 724px when the user clicks on a gallery, here is what it looks like: http://justinrancourt.visualbuffet.com/albumn/2005-summer-england

I want it to be structured like this (ironically it's working on the main page): http://justinrancourt.visualbuffet.com/albumn/

Any idea exactly which file I need to edit to get the albumn photos in the 724px template, and what exactly I need to change?

Thanks for the help