Sorry if this is inacurate but i don't really play guitar alot and this is the best I could figure out.  I guess its better than nothing though.  This is just the acoustic part that is always in the background.. there is way more to the song than just this.

Strum each chord about ten times.  Listen to the song for the timing.

    Am     Em     C      G

|---0------0------0------3-----------
|---1------0------1------3-----------
|---2------0------0------0-----------
|---2------2------2------0-----------
|---0------2------3------2-----------
|----------0-------------3-----------

If anyone has a better version please improve on mine or post your own.  Let me know if you come across it anywhere.