Change some colors in a small picture to make a video

Hi,

I have the following picture.
Attachment 15226

I'd like to make a short movie of it but making the colors of the rings changing. I'd like to do it in a small length (ie 15-20 sec that will run in a loop to make a dvd menu).

Do you know how can I do it ? I have Vegas (trial), Avisynth, VirtualDub, Photoshop (trial too).

Attached Thumbnails