As far as Jquery goes - is that in some files that are not written over each time your store is saved? The latest store I've designed is for these folks http://www.tishomingohistory.com/museum_store/
and I've got some non-geek volunteers that I'm trying to get up to speed to maintain it but they are struggling with the software -so I keep my backups !
I suppose the colorbox really works the way it should - auto-sizing to your browser window, perfect for the iPad and such. I just wanted to speed up my publishing and display times on slower bandwidth systems by finding out the optimal image size. There are other wishes I have for the Cart apps. I should bring those up in the proper forum listing. Thanks.

Colorbox is a JQuery plugin. You can use JQuery to do things dynamically once the browser window is loaded.