Doing Transitions like a pro

Hi All

I am seeking help in creating a specific type of transition. Like the one found in http://www.24-7media.de/ . Once a button is released it loads the relevent area with a transition and when you hit another button, it first closes the transition and then begins the next relevent transition.

The easiest way for me to learn this would be through viewing a already made FLA file. But some tutorial type help would be great too.

Thank You