2 different Galleries protected under one page?

Hello!
How can I do for create two different Galleries (or more), each one protected by an own password, but all together under the same page of the menu?

For be more clear:
I want to have a “Login Area” (page in menu) where, when you click on the page menu, it will open a page with all titles of the different galleries, everyone protected by her own password.

Thank you!

Paola

http://wordpress.org/plugins/nextgen-download-gallery/