loadMovie using AS2?

Hey guys i’m new to the forum here and also new to ActionScript 2 and Flash MX 2004. I haven’t been using 2004 that long and know just the basics in AS. I’m trying to load a movie using a button and have been looking for tuts online using AS2 but haven’t found much that can help me and I find it all very confusing. Would someone be able to provide me the code so that when you roll over a button or click on it the movie would load and when you rollout it would unload. Basically the movie is a submenu and i’ve tried numerous things using just AS but obviously that wont work in Flash MX 2004. If someone could help me out that would be awesome :).