A friend gave me two cd's with one avi file on each disc--the first half and second half of a dvd movie (of which i already own the real dvd). i'm wantint to put the two files together and burn them to a dvd, but the xvid compression seems to have thrown me for a loop. I'm using Sonic DVDit! program to make the dvd (i've added a menu and a few other things to the dvd; i just need to add the main movie to it now). any suggestions on what to do?