What is wrong with EvilSob suggestion?
I stumbled upon this method when I waas writing a dice game for Blitz3D.
I used a modeling software (TrueSpace if you need to know) to model a die, and I wanted the numbers to be mapped correctly by face. When I've done that, I found out that if you take the numbers on opposite sides, and add them together, you get seven. Ex. 1 + 6 = 7, 2 + 5 = 7, 3 + 4 = 7.
If you have a die handy, look at it?
BTW physics fans, does anyone know the meaning of GOD DOES NOT PLAY DICE, and where does it come from? Someone who hired me wanted me to write a game based on that method, and I also came across it in a pc game DEAD CHAOS?