Ok, incredibly basic stuff here, standard tuning, keep it clean gain wise and let all the notes ring.
1------3-------3-------3-------3------|I
2----0---0---0---0---5---5---5---5----|I
3--0-------0-------0-------0----------|I
4-------------------------------------|I
5-------------------------------------|I
6-------------------------------------|I REPEAT

  The two chords are, for reference, G and C. With this in mind, when it really kicks
and the drums come in I find embellishing it with the root notes on the lower strings
brings it out better (that'll be 3 on the 6th string and 3 on the 5th string for those 
don't know note names :) )

  Enjoy, it's a great song!