This is my first tab. I'm nearly 100% sure that it is right.

http://www.youtube.com/watch?v=1d-Kc_NklBc   That is the song

In the acoustic version of this song the bass line is played with the chords. It goes like this : 

|e-------------|
|B-------------|          
|G-------------|              
|D-------------|              
|A-------------|                 
|E--0--2--3----| G, G               

|e-------------|
|B-------------|
|G-------------|
|D-------------|
|A-----0-------|
|E--3-----2----| D, D

|e-------------|
|B-------------|
|G-------------|
|D-------------|
|A-------------|
|E--2--3--0----| Em, Em

|e-------------|
|B-------------|
|G-------------|
|D-------------|
|A-------------|
|E--0--0--0----| Em, Em

and back to the start again

When the chords come in you play G, D, Em, Em. listen to the song to figure out the strumming