E|-------------|-------------|-------------|-------------|
B|-------------|-------------|-------------|-------------|
G|-------------|-----4-2-----|-----2-0-----|-------2-----|
D|-----2-0-----|---4-----4-2-|---2-----4-2-|-0-0-4-------|
A|---2-----2-0-|-2-----------|-0-----------|-------------|
E|-0-----------|-------------|-------------|-------------|

This is the riff repeated throughout the whole intro as far as I can tell, The intro 
as just lead guitar, but is joined by rhythm chords, based on the base notes of the lead 
(E, B, A, G and A again)

Listen to the song to see how they fit with the lead guitar