Wireless network hacking?

is there any simple to use program/tutorial to tell me how to hack/crack into a wireless network. I'm at school and the Internetz we use here fails cause everybody is on it but the teachers have a personal network which is 5 times as good as ours so i'd like to use that network once in a while

thanks in advanced.

Aircrack-ng (Aircrack-ng). Read their docs.

Wireless card must support raw monitoring mode.
If you're on Windows, make sure you first check this out:
compatibility_drivers [Aircrack-ng]

inb4 MiTM attacks as method.

ohaidere, btw.

I think AirCrack only works with certain network drivers

Are my posts visible?

@eliran93
That is Aircrack-ng. And it works for WPA-PSK too.
Also, if you've used Backtrack, it shouldn't take that much since on Linux it can simulate packets instead of waiting for them as the case is on Windows.
@BigBangBaby
Works with nearly all on Linux. Some needs patching tho.

Thats easy :P
U just need Netstumbler and Aircrack.
And you only can hack WPA with those programmes

ok , can any1 teach me how to hack into wpa-psk?