dirack. every one of your images is different sizes. can you not render or take a screen shot that is 640x480 or lower?
In the render globals, set the render szie to 640x480. If it's a screen shot, in photoshop choose IMAGE - IMAGE SIZE and make it 640x480.
Dave Baer
Professor of Digital Arts
Digital Media Arts College
Boca Raton, Florida
dbaer@dmac.edu