Changing image on JButton when mouse is over it

Hi all

I'm trying to get a JButton to change the image when the mouse is over
it, but I can't get it to work.

The code:

ImageIcon icon = new ImageIcon("images/MRButton.png"");
JButton MRButton = new JButton(icon);

button.addMouseListener(new MouseListener(){

public void mouseEntered(MouseEvent arg0) {
//I have tried this - but i don't work :(
icon = new ImageIcon("lommeregner/images/MRButton_over.png");
}

public void mouseExited(MouseEvent arg0) {
//some code here ...
}

}

Can someone give me a hint to solve this little problem ?

/Brian
.

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