The only thing I found was the lyrics and the
melody (I think).
Maybe you can try finding out the chords yourself by listening to the midi-file available there.
Thats a nice weekend projekt. Or not.
Well I'll tell you if I find the whole tab.
Here it is:
http://sniff.numachi.com/~rickheit/dtrad/lookup.cgi?ti=BEERBRRL&tt=BEERBRRL