1998 SR5 A/C problem

[zombiemaker]

Was wondering if anyone had any advice for me on my ac unit. Just today my SR5 started blowing warm air with the A/C activated and I was wondering if anyone knew if I just need freon or if this is a compressor problem. The air comes out at its normal speed and doesn't get any colder with the recirculate function. Again I have a 1998 Black SR5 4Runner non 4WD.
Any help would be appreciated.