Okay, there is the intro.  the notes are octaves 
and they change fast.  i'm not sure the exact strumming pattern [it changes], just listen to the song.

e|-------------------------------------------------|
b|-------------------------------------------------|
g|-5-5--5-5-5--9-9--9--5-5-5-5-5-5--7--7-7-7--4--3-|
d|-x-x--x-x-x--x-x--x--x-x-x-x-x-x--x--x-x-x--x--x-|
a|-3-3--3-3-3--7-7--7--3-3-3-3-3-3--5--5-5-5--2--5-|
e|-------------------------------------------------|
                                      ^repeat once^

power chords are:

|------------------------------------------------|
|------------------------------------------------|
|-2-2-2-2-2--------------------------17-17-17-17-|
|-2-2-2-2-2--3-3-3-3-3-3--7-7-7-7-7--17-17-17-17-|
|-0-0-0-0-0--3-3-3-3-3-3--7-7-7-7-7--15-15-15-15-|
|------------1-1-1-1-1-1--5-5-5-5-5--------------|