Setting size of dynamically loaded flash movies

I was wondering if I could define a size for a dynamically loaded flash movie. So far here’s what I have so far to load the movie:

loadMovie(“objects/lefthand.swf”, “lefthand”);

The movie appears, but it’s too small and I’m trying to get it to match the size of an existing png that I’d like to replace with the movie in order to reduce the main flash movie filesize.