Look at a tool called Swffit http://swffit.millermedeiros.com/ - it resizes movies based on screen dimesions or a div size. Works great in scaling content.
Also (if you are using AS2 - similar commands
In this tutorial viewers will learn how to create a basic motion tween animation in Flash
Open a new document in Flash: Draw/import an image: Press CTRL + F8 to convert it into a graphic symbol: Select a frame (how long you want the tween to last): …