That is the opening chord. You play it four times. Then the main riff comes in.
G|554422--
D|55442255
A|33220055
E|------33
Bridge from main riff
D|45554555
A|45554555
E|23332333
Verse
A|-------------3
E|3333333333335-5-3
The bit where it ges "Now I got a reason...the Berlin Wall"
G|5555555555555555777777777777777
D|5555555555555555777777777777777
A|3333333333333333555555555555555 X2
Then it goes into the main riff.
Thats pretty much it, except the bit were Johnny is going on about them coming over the Berlin Wall, whilst he goes under the Berlin Wall, which goes something like...
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