Intro: 
D7 (with D and A as alternating bass notes) 

Verse: 
D7  D7  *  B7 (with B and F as alternating bass notes)  *  E *  A 

Chorus: 
D7  G7  G#dim  D7  A  * 

* Walk up and down the A string between chords 

   G#dim 
     x 
     3 
     4 
     3 
     x 
     4