This is an acoustic version, there are some vids on YT so you can play along and 
see that those are the correct chords.
The whole song must be played with bar-chords
http://www.youtube.com/watch?v=ZBC_RWGkEvY


Intro: D7 C#7 C7 G G7
    
Verse:
(after each G accord at the beginning of the verse, you can do a transition from 
F to G to give this part a little bit of color)    
         G  (F-G)
I love you
                 G  (F-G)
But I gotta stay true
                     G  (F-G)
My moral's got me on my knees
                G  (F-G)
I'm begging please
                G
Stop playing games
 B7  C7  C#7         D7                       
I don't know what this is
        C#7      C7    
But you got me good
                  G                         
Just like you knew you would
                      D7
I don't know what you do
         C#7     C7        
But you do it well
                B-C-C#-D-D7            
I'm under your spell      


Chorus
                             G
You got me begging you for mercy

Why won't you release me
                             C7    
You got me begging you for mercy
                       G
Why won't you release me
D7        C#7    C7   (B7  C7  C#7  D7)
I said you better release me


Now you think that I
Will be some thing on the side
But you got to understand
That I need a man
Who can take my hand, yes I do

I don't know what this is
But you got me good
Just like you knew you would
I don't know what you do
But you do it well
I'm under your spell

You got me begging you for mercy
Why won't you release me
You got me begging you for mercy
Why won't you release me
I said you better release me

I'm begging you for mercy
Just why won't you release me
I'm begging you for mercy
You got me begging
You got me begging
You got me begging

Mercy,
Why won't you release me
I'm begging you for mercy
Why wont you release me
You got me begging you for mercy
I'm begging you for mercy
I'm begging you for mercy
I'm begging you for mercy
I'm begging you for mercy
Why won't you release me
Bring it on

Mercy
Begging you for mercy
You got me begging
Down on my knees
I said mercy
Begging you for mercy
You got me begging