This intro part is played whilst the lead solos over.

E|-------------------------------|
B|-------------------------------|
G|-------------------------------|
D|-------------------------------|
A|--7------10-----12-----3-0-0-0-|
E|--5------8------10-------------|  X2

The main riff then kicks in with both guitars playing this part.

E|------------------------------|
B|------------------------------|
G|------------------------------|
D|------------------------------|
A|------5-----3------7--5--7-7--|
E|--5-5---5-5---5-5--5--3--5-5--|  X3
                     ^^
                     ^^
on the fourth riff, playing stops where the arrows are shown, for the lead to do a pick 
thing down the neck.

This riff carries on for ages, until theres a change in the song, i could be mistaken on 
tabbing for this part.

E|-------------------|
B|-------------------|
G|-------------------|
D|-------------------|
A|--10-----(b9)-----7--|
E|--8------7------5--|  X2

The main riff kicks in again and is the same until the next change when its as above ^^ 
that after it, the song changes again:

E|-------------------|
B|-------------------|
G|-------------------|
D|-------5-----5-----|
A|--7----3--5--3--5--|
E|--5-------3-----3--| this carries on a few times.

then the intro starts. and then the main riff again until the until the end of the song.