Need help getting wpa-spk

[Flock]

So, im on my school's laptop, it is connected to wifi, and it has the password already entered, so it automatically connects to wifi. I just got the BIOS password so I can boot to Backtrack, how can I crack the wpa-spk encryption?
Need help, thanks
Flock <3

[purehate]

If the school wanted you to have the password, they would have given it to you.