Andrew Kramer did a tutorial a few years ago, it was to reveal text, but it might be worth a look:
http://www.videocopilot.net/tutorials/blueprint_reveal/
Johnny Cuevas, Editor
Thinkck.com
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."---THOMAS EDISON on inventing the light bulb.