This is a very simple song, there are only 3 chords:
E|----...----...----|
B|-0--...-0--...-0--|
G|-9--...-7--...-5--|
D|-9--...-7--...-5--|
A|-7--...-5--...-3--|
E|----...----...----|
It's very easy find the tempo, then i don't specified it...
However here there is a video (http://www.youtube.com/watch?v=9F8fiy5cGNY) that can help you!
Enjoy :)