Publishing Flash movies so they fit the background

well I have a Flash movie that has a lot of movieclips with transparent backgrounds (from importing from PS). Well, Everytime I publish, the movie is VERY big because of the images with transparent backgrounds. I want to be able to publish the movie so everything is cut off except the content in the background (the dimensions given to the movie in the properties dialog box). Does anyone know how to do this?

Thanks

Mike