Click on the background layer, the one with the original picture on it.
On the background lower layer, right-click on Frame 20 & Insert a keyframe.
On that same layer, insert another keyframe at Frame 40.
Then grab Frame 1 of the TOP layer, drag it over and drop it into Frame 40 of the bottom layer.

Click on Frame 20, and hit Ctrl-B to break yourself apart to tiny dots.
Then click somewhere between Frame 20 & 40, like Frame 30.
Under the properties bar at the bottom of Flash, change the Tween option to: Shape Tween.

If a green shaped "Tween" bar between Frame 20 and Frame 40 appears, you did it.. If the green arrow bar fails to show, you most likely did not break apart the image on frame 20. Try again!
This is what your timeline should look like.

Lastly, delete Layer 1 and hit Ctrl+Enter to view your work.
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