Okay guys this is my first tab, so take it easy on meh. I tabbed this by ear, and 
watching their acoustic youtube video. For strumming watch the video or listen to the song. 
Here's the video I used: http://www.youtube.com/watch?v=7HVl69MHGss
Oh and I'm not sure what the chords are called, but they are usually shaped with the 
third fret of the high e and b string down. Like Em would be:
0-2-2-0-3-3            So yah, Have fun figuring it out! I did (:

CAPO 1ST FRET

Intro:

G - D - Em - C (x2)

Verse:

G - D - Em - C (x4)

Pre-Chorus:

Am - Em - C
Am - Em - C - D~

Chorus:

G - D - Em - C
Em - Gsus4 - Em - C (x2)

Repeat Intro!

Verse 2! same as verse 1 (just not the words)

Pre-Chorus

Chorus

Bridge:

C - G (with deadened strumming) (x2)

Pre-Chorus

Chorus (x2)
Second time, end with:

G - D - Em - C

Outro:

G- D - Em - C~