The four-chord pattern in the intro is Bm/Am/C/D. You strum each one a couple times, 
listen to the recording to get the rhythm. Here are the voicings:

Bm (x24432@1) Am (x02210@1) C (x32010@1)  De----7----5-----------------| (xx0232@1)B----7----5----5----7-------|
G----7----5----5----7-------|
D--------------5----7-------|
A---------------------------|
E---------------------------|

Next intro segment:

e-----------------------------------------------------------------|
B----3-3-3-3------------------------------------------------------|
G----2-2-2-2---4^2^0----------2-2-2-2---------------------4-------|
D----0-0-0-0---------4^2^0----2-2-2-2----4^2^0------------4-------|
A-----------------------------0-0-0-0-----------3^2^0-----2-------|
E-----------------------------------------------------------------|

e----7----5-----------------|
B----7----5----5----7-------|
G----7----5----5----7-------|
D--------------5----7-------|
A---------------------------|
E---------------------------|