Loads an external movie

Can someone help me?

im on a proyect that requires an external movie clip to load on a main movie. That’s easy, the hard part is that i need that the loaded to be movie loads without adapt the settings of the main movie (main movie: height=100%, width=100%) so if the main movie works as a fullscreen background the loaded to be movie retain the actual size w 500 x h 300. Thanks in advance.