Graphics for ChessApplet

Hi Dears
I am developing chess game written as an JavaApplet.
Using Borland JBuilder 9 Personal Edition.
I use the following  Code
 void this_mouseDragged(MouseEvent e)
 {
}
class Chess_this_mouseMotionAdapter extends java.awt.event.MouseMotionAdapter
{
     Chess adaptee ;
         Chess_this_mouseMotionAdapter ( Chess adaptee )
         {
               this.adaptee = adaptee ;
         }
         public void mouseDragged ( MouseEvent e )
        {
              adaptee.this_mouseDragged ( e ) ;
         }
}
But it seems that it still fire when the mouse button is released.
The Applet are on the following URL
http://w1.201.telia.com/~u20100003/Chess.html

Verry Thankfull for Tips or Advice.
Sincerely
Urban Avierfjärd
Gotland, Sweden