Discount Portable Multimedia Projectors Cheap

I’m running 2 laptops & a dvd through a video switch to 2 lcd monitors & an XGA projector. I’ve connected everything with svideo cables (not VGA). When I’m using the laptops my lcd’s are perfectly clear but the projected image through the XGA is incredibly blurry. Note that if I run the laptops to the projector with VGA the picture is clear. Is it the projector itselft or is this an issue that can’t be resolved?