The intro, by the guitar is 8 bars long. On the 9th (15 seconds)
come in with the Main Riff:

Main Riff
G|--9--999--|--9--999--|------------------|--------------|
D|---------7|---------7|--9/16161616161616|16-14---------|
A|----------|----------|------------------|------16-14---|
E|----------|----------|------------------|------------16|

G|---------|----------|---------|----------|
D|--7--777-|--7--777--|--7--777-|--7--777--|
A|--------5|---------5|--------5|---------5|
E|---------|----------|---------|----------|

The 16's above, are twice the speed of the 9's; listen carefully
and you'll understand.

Main Riff x5

The come in with the Chorus:

Chorus (Pt1)
G|--------|--------|--------|--------|
D|--------|--------|--------|--------|
A|--------|--------|--------|--------|
E|00000000|00000000|00000000|00000000|

Chorus (Pt2)
G|---------|---------|---------|---------|
D|---------|---------|---------|---------|
A|---------|---------|---------|---------|
E|33-5-33-5|33-5-33-5|33-5-33-5|33-5-33-5|

Chorus (Pt1 Pt2) x2

Main Riff x2

Chorus (Pt1 Pt2) x1

Chorus (Pt1) x1

Ending Chorus Pt2:
G|---------|---------|---------|---------|
D|---------|---------|---------|---------|
A|---------|---------|---------|---------|
E|33-5-33-1|33-5-33-1|33-5-33-1|33-5-33--|

End with:

G|--|
D|--|
A|--|
E|1~|

Comments, improvements etc, email me:
dave@confusedpublic.com