Here is the relatively simple bass
When it starts on the verse, you play:
A------3---------- 
E-3---------5----4 with sufficient pauses for the 
guitar to be able to pick over a 5th root chord.
Then, as a fill the second time through, play:
A-3-4-5-2
E---------3(this G is the first in the next time through)
Then, third time through:
A------3-------------
E-3---------5---4-5-4
The timing is not exactly right, but listen to the song.
For the chorus, play:
A---------3-3---------3-3
E-3-3-3-3-----5-5-5-5----
The pre-bridge(that's the best way of describing it):
A------3-------------
E-3---------5-5-5-4-4
Then the bridge itself:
A-2-2-2-2-2-5-5--0-0-0-0-0--3-3
That's it.  Pretty simple, but when you put it with 
the guitar, it sounds really grrrreat.  Mike Farmer