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!