hi , this is the major riff in the song , you can play it in 3 different thingis :P ...
it is :
e-3-3------3-3---|
B-----3--3-----3-|
G----------------|
D----------------|
A----------------|
E----------------|
or like this
e-*20-*20----------*20-*20------|
B---------*20--*20---------*20--|
G-------------------------------|
D-------------------------------|
A-------------------------------|
E-------------------------------|
or like this
e-x-x------x-x---|
B-----x--x-----x-|
G----------------|
D----------------|
A----------------|
E----------------|
That's it , enjoy!