Drop the tuning down a 1/2 step.
Not played on guitar in the song, but sounds fine on guitar.
|------------|------------|------------|------------|
|------------|------------|------------|------------|
|------0-----|------0-----|------------|------------|
|----0-------|----2-------|------2-----|------0-----|
|--2---------|--3---------|----2-------|----2-------|
|------------|------------|--0---------|--3---------|
[ Tab from: http://www.guitaretab.com/s/stars/98882.html ]
A couple different strum patterns throughout the song, but it's always this progression.
|--3---------|--3---------|--0---------|--3---------|
|--3---------|--0---------|--0---------|--0---------|
|--0---------|--0---------|--0---------|--0---------|
|--0---------|--2---------|--2---------|--0---------|
|--2---------|--3---------|--2---------|--2---------|
|--3---------|------------|--0---------|--3---------|
Really awesome song, and it's really easy to play.