Basic chord progression:  
verse
A --> A(E on d string drops to F# on E string)--> E --> Dsus4 --> A --> Dsus4

chorus (it wears me out...)

this obviously has some variation to it
B --> A --> B --> A --> Dsus4 --> A (back to verse)

basic bass line:

Verse : (repeat this until the songs gets quiet with the line...and it wears me out...-which is the chorus section)

|---------|---------|---------|---------|
|---------|---------|---------|---------|
|---------|---------|---------|---------|
|----5----|----5----|----2----|---2-----|

|---------|---------|---------|---------|
|---------|---------|---------|---------|
|---------|---5-----|---5-----|---------|---------|---5-----|---5-----|---------|
|---0-----|---------|---------|----5----|----5----|---------|---------|----5----|

Chorus                                    :||
|---------|--------|---------|
|---------|--------|---------|          (this section immediately below is what happens...
|--2------|--0-----|---2-----|-----0----|-----5555---|----0----|
|---------|--------|---------|          ...usually right before they go back into the verse)



This song you will have to listen to the recording for precise timing and accuracy since I did it

off the top of my head.  It gives the basic idea though.  O'Doyle Rules!