this is what the riff part is i believe

E------------------------------------------------------------------|
B------------------------------------------------------------------|
G---------------------------------------------------------------1--|
D---------------1-----------------------------------1-----1--4-----|
A------1--2--4-----4--2--1-----------------1--2--4-----4-----------|
E---4-----------------------4----------4---------------------------|

but i find that the song is easier to play with a capo on 1, so that nice chords can be 
(Em, C, G etc)

and so this riff look like this relative to the capo:


E------------------------------------------------------------------|
B------------------------------------------------------------------|
G---------------------------------------------------------------0--|
D---------------0-----------------------------------0-----0--3-----|
A------0--1--3-----3--1--0-----------------0--1--3-----3-----------|
E---3-----------------------3----------3---------------------------|