MASK?

1. first thing you do is have an object or a text
2. put a keyframe in
3. you insert another layer
4. make or add an object
5. insert motion tween to the layer
6. make the object what ever you want by the end of the keyframe
7. go to modify
8. go to timeline (layer properties)
9. click on mask and lock
10. go to the other layer
11. go to modify
12. go to timeline (layer properties)
13. click on masked and lock
14. play the movie and the END