I have listened to many different versions,
and they are all different.  However, these
are the basic peices that they all use.
Sorry, but its up to you to find out how
to put em together.

E-----------------]
B-----------------]
G-----------------]
D-------5---------]
A-----7--------7--]
E---0-----6-5-----]

This theme is continues through most of the song

you hear this chord over top of it a few times:
E--0----]
B--0----]
G--0----]
D--2----]
A--2----]
E--0----]


E---------------------------|---------------------------|---------------]
B---------------------------|---------------------------|---------------]
G---------------------------|---------------------------|---------------]
D--22222223x2222223x2222225-|--22222223x2222223x2222225-|---5-2-32-4542-]
A--22222223x2222223x2222225-|--22222223x2222223x2222225-|---5-2-32-4542-]
E--00000001x0000001x0000003-|--00000001x0000001x0000003-|---3-0-10-2320-]
 I usually do this with a palm mute,
 it makes it sound nice and scratchy



Those are the basic pieces that form all the versions of this song.
If you know specific variations, please post them in the corrections