In this when I say A maj 7 I mean A with the middle of the three fingered strings played on the first fret! 
A5
When I buy my mansion
     A5
I'll invite the world to stay 
      D5 
So everyone can see
     A5
A Picture of Dorian Gray

A5
We'll sit by a river
A5
drinking lemon tea
D5
And there's a thousand idiot russians
A5
in midget submarines

Chorus:
A5
You can come and stay
A5
You can bring your friends 
D5
You can come and stay
F#5
For a day
                 A5                                      A5 maj 7
And see a picture of dorian gray
                   A5                                   A5 maj 7
And see a picture of dorian gray

A5                                        A5 maj 7
Take you to my mansion,see my gallery
D5
Lots of pretty pictures
A5
All of them of me
A5                                A5 7 
We'll sit by the river drinking lemon tea
D5                                                  A5
Eat tiny cucumber sandwiches made by Emily

A5
You can come and stay 
A maj 7
You can bring your friends 
D5
You can come and stay
F#5
for a day 
                   A5                                      A5 maj 7
And see a picture of Dorian Gray 

and the just repeat the song but on the second time play the last line a few more times