To do what you want isn't too tricky, but it isn't unbelievably easy either. If the avi files have exactly the same sound and video compression etc. they should be ok. I'm sure there are easier ways.
(, Sun 8 Feb 2009, 15:20, Reply)
They are the same film, it is just in a couple of parts :)
(, Sun 8 Feb 2009, 15:21, Reply)