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You may not be able to keep people from printing it, but if it is wider than 640 pixels, it won't fit on a piece of standard 8 1/2 by 11 sheet of paper.
While this does not solve the problem, it would prohibit most novice internet users from printing the contents. They can print, but it is mostly useless.
Although, I guess they could print landscape if they really were determined to get it.