This is the main riff.I think it is in the correct key,although a little transposition may be required.

G,C,E,D

or in other words:

E-3-3--3-3-3-----7-7--5-5-5---------
B-3-3--5-5-5-----9-9--7-7-7---------
G-4-4--5-5-5-----9-9--7-7-7---------
D-5-5--5-5-5-----9-9--7-7-7---------
A-5-5--3-3-3-----7-7--5-5-5---------
E-3-3--3-3-3-----7-7--5-5-5---------

sorry,about the timing not being very good,although this is my first TAB.