how to make a "jump" in 3D ?

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Insane Games
 #1
I using a B3D file as map for my FPS game. I saw a few codes out there for FPS-jump, but most of them have a big problem : if you are in the air and press the jump button, it does not check if the player can jump, it just jumps !
So if you press the jump button lots of time, you just fly away... hehe

How can i avoid that problem ?

Thanks.
MD