I have a hopefully simple to solve problem - I have a series of 4 .avi files which I would like to view in the same movie at the same time.

Basically, I have a piece of software which outputs pictures every 1 second or so, which I then combine into a .avi file using VideoMach, so I can see a system evolving in real time. However, there are 4 different sets of pictures, which result in 4 different movies.

I would like to be able to see each of these 4 movies at the same time, allowing me to see the evolution of the system from each perspective. I have seen this done before, but I have no idea how. Any help would be appreciated.