I should known alison would come in here and defend disco....
OK, the chords are:

Fm7 EbFm / Fm7 EbFm / Bb7 - / - - / Fm7 - / - - / - - - / Fm / Eb / Fm / Cm7

Hey, alison, that site has a Stayin' Alive (click) MIDI in LIVING STEREO! Takes me right back to the seventies. I think I've lost 20 pounds, and my hair turned brown again.
-Joe Offer, who may live to regret this-