It is as wide up and down. I dont know how ells to describe it.?
This is known as "keystoning". Serious cameras used for taking pictures of architecture and things like that use lenses that can be shifted offcenter to correct for parallax ; something similar ought to work in a projector. https://secure.wikimedia.org/wikipedia/en/wiki/View_camera#MovementsVideo projectors generally solve this in the electronics instead, by distorting the image to compensate... cheaper, but loses some resolution.
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Well, one way is to introduce the reverse error when shining the projector on a mirror to project to the wall.