Need help scrambling image placement

I'm trying to come up with a game in which players are presented with four images and they must pick the correct one. There will only be four possible positions for the images to appear. I want to make sure that the "correct answer" image is always shown when the images are scrambled.

To put it another way, I've got images A, B, C & D, and positions 1, 2, 3, & 4. How do I make sure all four positions are filled with an image and that the "correct answer" is always shown and only shown once?

views:887 update:2011/12/30 9:10:41
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