First riff ever tabbed by me :D
there may be some small variations in there somewhere, but this is a general outline.

The first bar goes something like this i think:....

E|---------------------------|
B|---------------------------|
G|---------------------------|
D|----------------3----------|
A|-3h5--3h5-0h5------5--5----|
e|---------------------------|


You should be able to get the drift of it

E|---------------------------|---------------------------|
B|---------------------------|---------------------------|
G|---------------------------|---------------------------|
D|------------3--------------|--------------3------5-----|
A|--3h5--3h5-----5----5------|--3h5--3h5------5----------|
e|---------------------------|---------------------------|