This is a really easy song to play. this is the way i play it anyway not sure if its entirely correct but it sounds right. comments and corrections welcome!

Intro 
G:--------------------------------------------
D:--------------------------------------------
A:-222-22-2-22-222--222-22-2-02-222-----------
E:--------------------------------------------

Pre chorus
G:--------------------------------------------
D:--------------------------------------------
A:-222222/5-----------------------------------
E:--------------------------------------------

Chorus
G:--------------------------------------------------------------------
D:--------------------------------------------------------------------
A:-22222222222222222222/5--2222222233222222222222/5-------------------
E:--------------------------------------------------------------------

the ending then is just like the chorus only longer and you dont slide up to five on the a string until the very end.