Lady Ada at Adafruit solved my problem. She lists a program that does exactly what I wanted.
Jim_Cook:
I just assembled the 16X32 LED Matrix from Adafruit and Backpack from nootropic. The backpack acts as an Arduino Uno and uses the "print()" function. The LED matrix can display only five characters at a time. I would like to scroll longer words. Can someone point me in the direction of example codes that will scroll long words?Thak you.