I've attempted to work this song out by ear - converted to guitar from piano........

the chords are(capo 1st fret) G, Gsus2, G6/Em7, Gsus2/F#

G (320003@1)      Gsus2 (3x0233@1)   G6/Em7     Gsus2/F#

----3----  ----3----  ----3----  ----3----|
----3----  ----3----  ----3----  ----3----|
----0----  ----2----  ----0----  ----2----|
----0----  ----0----  ----2----  ----0----|
----2----  ----x----  ----2----  ----0----|
----3----  ----x----  ----0----  ----2----|

Your ring and pinky fingers shouldn't move from the position they are in when you fret 
G. a varient on this song is to replace the Gsus2/F# chord with a Cadd9 chord, but I feel 
it sounds better the way i have tabbed it. so enjoy and any comments are welcomed :)