Jittery output image to projector

I am using the iMac video output to feed a 1x4 VGA splitter going out to 2 projectors (front & rear). The image on the front projector is jittery - the rear image is stable. This only occurs with the iMac. I've tested it with my Macbook and a DVD player and the front projector image remains stable - except with the iMac. I've tried using all the other outputs of the VGA slitter with no change. Any other ideas?

It would be easy to do this via a servlet but we want it to work offline as well as online. We don't want to display it in the applet as it doesn't contain a GUI and we want the interface configurable completely in HTML. Excluding these most obvious solutions, any other ideas?

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