Using 2 Digital Projectors from multi video sources

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Here one for you mylotters! I have 2 Digital projectors, I currently use one, but would really like to set the 2 up so that i can show the 1 picture split in half for each projector... This is for showing film, still picture, and animations. So not high def. Each projector is 600 x 480 pixels... I have a PC driving at the moment, I have tryed using the twin VGA outputs, but this does not split the image correctly for joining them back together on the screen.. Do i need an expensive video processor, or can this be done with software or cheaper hardware? Lowest cost solution would be great