comment changer le background image?

salut voici comment tu peux proceder:
Code:
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public class MyFrame extends JFrame {  
     private JPanel contentPane;  
     /**  
      * Launch the application.  
      */  
     public static void main(String[] args) {  
          EventQueue.invokeLater(new Runnable() {  
               public void run() {  
                    try {  
                         MyFrame frame = new MyFrame();  
                         frame.setVisible(true);  
                    } catch (Exception e) {  
                         e.printStackTrace();  
                    }  
               }  
          });  
     }  
     /**  
      * Create the frame.  
      */  
     public MyFrame() {  
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
          setBounds(100, 100, 450, 300);  
          contentPane = new JPanel() {  
               public void paintComponent(Graphics g) {  
                    Image img = Toolkit.getDefaultToolkit().getImage(  
                              MyFrame.class.getResource("/images/bg.jpg"));  
                    g.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), this);  
               }  
          };  
          contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));  
          contentPane.setLayout(new BorderLayout(0, 0));  
          setContentPane(contentPane);  
     }  
}
Eric