Reorder Album on main gallery page only visible to admins.

Which file do I need to edit so that only admins are able to reorder albums on the main gallery page?

The following information is required to get an answer:
Get this information from the PHP diagnostic (in the configuration wizard).
Gallery URL (optional but very useful):
Gallery version:1.5.1 and 1.5.2
Apache version:
PHP version (don't just say PHP 4, please):
Graphics Toolkit:
Operating system:
Web browser/version (if applicable):
http://www.trueppc.com
http://www.trueppc.com/gallery