The intro is played by two guitars, one slightly distorted, the other 
with a clean tone....the distorted guitar's riff is played a few more 
times in different parts of the song.  Just listen to it to get all 
the parts right:

guitar 1 (a little distortion):

e |--12----10--(b9)12--6---|-6--6/8-8/10----------------|    Repeat 
B |------------------------|----------------------------| this 6 times
G |------------------------|----------------------------|

guitar 2 (clear tone):

comes in on second measure the first cycle of the riff guitar one is playing

e |------------------------|-7
--12--12/7--7--7
----|    repeat 4
B |------------------------|----------------------------|     times
G |------------------------|----------------------------|

on fourth time play this for second guitar:

e |-12/7--7--7
--12-13/7-|               e |--14/8-8-14\8-14/7-|
B |------------------------|    then this  B |----------------------|
G |------------------------|               G |----------------------|


then the bass and drums come in for their little intro and during that 
the distorted guitar plays something close to this slowly in rythym 
with the bass:

D -12-12-12-12-12---12-12/11-11/10--10-10-10-10-10---10(b9)9/8--8-8-8-8-8


then comes the main riff, and oh how nice it is:

all strums are DOWN-

e |-7-7-7-7-7--7-7/6-6/5--5-5-5-5-5--5-5/4-4/3-3-3-|
B |-7-7-7-7-7--7-7/6-6/5--5-5-5-5-5--5-5/4-4/3-3-3-|
G |-8-8-8-8-8--8-8/7-7/6--6-6-6-6-6--6-6/5-5/4-4-4-|
D |-(b9)(b9)(b9)(b9)(b9)-(b9)9/8-8/7--7-7-7-7-7--7-7/6-6/5-5-5-|
A |-(b9)(b9)(b9)(b9)(b9)-(b9)9/8-8/7--7-7-7-7-7--7-7/6-6/5-5-5-|
E |-7-7-7-7-7--7-7/6-6/5--5-5-5-5-5--5-5/4-4/3-3-3-|


I'm not sure but I think that right before the main riff is played 
this chord is strummed once :

e 6
B 6
G 7
D 8
A 8
E 6

the main riff is repeated it I think 5 times and then goes back into 
the intro riff the distorted guitar played and then back into the main 
riff later and then....you get it.

oh, towards the end there's a little dink of a riff that sort of hangs 
there until the end - I forgot to figure that out but it shouldn't 
exactly be difficult.


that's about it.

disclaimer: I figured ths out on an acoustic guitar so keep that in 
mind while you fix the mistakes....