The bass line to this song is really simple and it took 
me about half-an-hour to learn the whole bass line. 
Anyway, this is a really nice song to play so here it is...
I dont know the exact tempo but space it out as medium - medium fast.

VERSE 1
G --------------------------------
D ------------------6-6-6-7-7-7-7-
A 7-7-7-7-7-7-7-7-7---------------
E --------------------------------

VERSE 2 
G --------------------------------
D --------------------------------
A --------------------------------
E 0-0-0-0-0-0-0-0-0-4-4-4-5-5-5-5-

BRIDGE
G --------------------------------
D --------------------------------
A 2-2-2-2-2-2-2-2-0---------------
E --------------------------------

CHORUS
G ----------------------------------------------------------------
D ----------------------------------------------------------------
A --------222222224444444400000000--------222222220000000000000000
E 00000000------------------------00000000------------------------

LEAD ONTO GUITAR SOLO
G -----------------------------
D -----------------------------
A ----------4444---------------
E 2222--4--5----2222--4--5-----

FINAL 3RD
G -------
D -------
A -------
E 0-0-0-0

VERSE 1 x 6
VERSE 2 x 2
BRIDGE
CHORUS 
VERSE 2 x 2
VERSE 1 x 4
VERSE 2 x 2
BRIDGE
CHORUS x 2
LEAD ONTO GUITAR SOLO
Guitar solo...so that means you take a rest...
FINAL 3RD
VERSE 2 x 2
CHORUS x 2
VERSE 2 (stop abruptly after playing last note)

I hope you enjoy playing this bass line...have fun!