[Next Gen Gallery] How to display in custom template

Hi,
I am using nextgen gallery on my blog. When we click on any gallery image it displays in a box right? . What I want is that when I click on gallery image (individual image) it opens up in a new page under my chosen template. I have a flashy template called (Custom1) I want that when gallery items are clicked they open up in a new page with custom1 template.
Any help would be highly appreciated. As I need it urgent.
Thanks,
Ahmar.