puzzled by Sliding Puzzle

[trickD]

I've figured out a 12 piece slide puzzle game with draggable movie clip buttons (which I called tiles-thus 11 tiles and one blank space) so now the two challenging parts are:
1) how to jumble the "tiles" on the first mouse click (after viewing in "original" or "solved" state)could it be simply a load movie thing, where I have a "jumbled " movie load into a level above over a "solved" movie?
and
*2)how can the projector or movie itself detect when the puzzle has been "solved" by the user to initiate an entirely new scene. if "puzzle is solved" then....(??)

any comments are welcome and appreciated...
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trickD
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[Little Ben]

To check whether the puzzle is solved, could you have a looping mC that checks to see if the pieces are in the correct place and if 'true' to do something.

If (GetProperty ("piece1", _x) = xpos AND
GetProperty ("piece1", _y) = ypos AND
etc.)
Do something
End If