Jumping Animation

For a platformer, how would I make it switch to a jumping animation while player is in the air, and back to idle when he lands, needs to work with different height platforms, thanks :)

I belive there is conditions such as "Is jumping", "Is falling" and "Is landed" etc. You need platform behavior for those. They pretty much make the magic happen.

Wow thank you :o I really should look into this more before I ask people about it xP