Hi Anderson-
If you're not shooting video for broadcast, you generally souldn't have to worry about this. All you'll need to do is make sure your video is the same frame rate. Secondly, make sure the timecode for both is set to either "drop frame" or "non drop frame," and make sure all video sources are the same. If they're different, you'll get that drift. Here's a video talking about the difference between the two:
http://www.youtube.com/watch?v=ykjyNeuQROU
