there is another tab on this site but i find it sounds alot nicer if you play the following:

E :-2-2-2-2-2-2-2-2-0-0-0-0-0-0-0-0-|
B :-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-|
G :-2-2-2-2-2-2-2-2-0-0-0-0-0-0-0-0-|
D :-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-|
A :---------------------------------|
E :---------------------------------|

This is the main riff and it is incredibly easy to play, it is just based around the D 
and it sounds great on an acoustic guitar.