Here is the description of the application as described on the 4images home page:

4images is a powerful web-based image gallery management system. Features include comment system, user registration and management, password protected administration area with browser-based upload, HTML templates for page layout and design, search engine and a lot more. 4images is free for private and non-commercial use.

If you've installed MT, then you can handle the installation of this software. Some web hosts even offer this software as a free add-on, you simply choose a username and password, click a button and the software is installed for you automatically. If you're interested in this software, ask your web hosting service to see if it's available.

Don't be intimidated because the front page of the 4images site is in German. All of the installation instructions are available in English.

Here is my site, set up with the default templates and only a few photos. There are also family photos on the site but they are password protected. I created logins for my family so that they can see all of the photos on the site.