The previous code should be placed in the FRAME ACTIONS (if you don't know what this means, please go through the beginner tutorials from the Help menu in the Flash authoring environment), sometime when a movieclip with the INSTANCE NAME "myMovieClip" is present.
This will automatically give *some* of the button behaviours, still remaining basically a movieclip.
There are other ways to achieve the same effect, this is the cool thing about Flash.
Hope this helps
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