Loading an external flash movie

Hi
I have this project I am working on with Flash MX 2004. I have a primary flash movie which acts as a menu I guess. This movie has buttons that are supposed to open another flash movie (.swf format). When clicked, the other movie seems to open fine, but there are some formatting issues. For example, the primary movie’s background color is white and its size is 1024x768 and the other movies have a blue background and are 640x480. When go from the primary movie to another movie, the background changes properly and the document resizes, but when I go from the other movie to the primary movie the background remains blue and the size is still 640x480. I have tried many different actionscript codes to open the movies, right now I am using loadmovieNum… I should also mention that this is not going to be played through a web browser, probably as an .exe file so I can have it autorun from a CD. I hope this makes sense, any help would be greatly appreciated