This song is fairly easy and is played in standard tuning.
Main Riff Played The Whole Way Through Until Bridges:
G----------|
D----------|
A-55-4-9-5-|
E----------|
Bridge (Also Played In Guitar Solo):
G----------------|
D----------------|
A-55-44-99-7-7-7-|
E----------------|
Thats about it, its pretty easy to play and doesn't take much practice (a good first song to learn)!