E--0------------------------------------------|
B---------------------------0--------3--------|
G--------------------0--------0----2---2------|
D----------------0/2------0------0------------|
A-0---0-2-3--3--------------------------------|
E-----------------------3---------------------|

E----0----------------------------0-----------|
B----------------------------3--------3-------|
G---------------------0--------2--------------|
D-----------------0/2------0------------------|
A-0----0-2-3--3-------------------------------|
E------------------------3--------------------|

That's the intro, although i can't play it jet. but i copied it from someone else, 
he or she didn't know the chords.
And I'm not sure if they're right, but let's give it a try.

                AM                         CI (x32010@1)wanna Shout it from the rooftop
            G (320003@1)              DI'm (xx0232@1)in love I'm in love
                AM                          CAnd (x32010@1)the favourite thing to do
                         G (320003@1)                             DIs (xx0232@1)thinking of you, is thinking of you


and so on.
i hope it's okay?