Marquee Text Effect Problem

I have a problem. I want to continuously marquee lines of text across the screen using a scene behavior, but due to what I've previously encountered with one of my games' demos, I'm afraid that a part of the screen will get clipped by a big black box. I have an actor ready to display the text, but how do I get the text to start at the right edge of the screen and detect when all of it leaves the screen by its width?

Never mind, I did it.