saving a flash movie with just the stage

how to I save/export a flash movie so that it just saves the contents inside of the stage? There are certain things that overlap the stage and fade into it from the ouside in which I don't want to be able to be seen when increasing the screen size of the mo开发者_开发知识库vie.

basically, I want to be able to make the screen as big as I want (using percentage in browser, and yes everythings a vector) with nothing but the stage showing.

How would I accomplish this?

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Depending on how complex your movie is you could create a mask layer as our uppermost layer which contains a rectangle matching the size of the stage. Apply the mask to all the layers below.