[solved] Double Jump

[Beasty]

First: Hello LFE
For a character i need a simple double jump. Not a triple or even infinite jump, that's what i got when i tried it myself. It just should do a second jump while in mid-air or falling. I already searched the forum and mainsite for a solution, and found nothing useful.
If a double jump is possible, i would be grateful for help. Thanks in advance,
Beasty