🚀 go-pugleaf

Hello,
my system: Windows NT4, JBuilder3.0.
i have two class:

public class CadreExpo extends JFrame {
........

  JPanel jPanel2 = new JPanel();
  .........
  //Construire le cadre
  public CadreExpo() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
     ChoixLangue.setLangue("FRAN");
    try  {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }

////////////////////////////////////////
///////////////////////////////////////
 jPanel12.add(new CadreAffichePicto()); or  jPanel12.add(new
CadreAffichePicto(jPanel12));
///////////////////////////////////////
/////////////////////////////////////
  }
...........
........
}

An an another class  CadreAffichePicto at which i load two pictures :a map
and a pictogram above.

public class CadreAffichePicto extends JPanel {
  MediaTracker tracker;  Image picImage =null;
  Image fondCarte= null;

  //TransparentImage jPan;
  private JPanel jPan;
  //BorderLayout borderLayout1 = new BorderLayout();
  public CadreAffichePicto() {

        construireCarte();
       }

  public CadreAffichePicto(JPanel _jPan) {
   // Il faudra mettre le ou les picto avec leurs positions respectives
    jPan=_jPan;
    construireCarte();
    }

  public void construireCarte() {
   tracker = new MediaTracker(this);

     // onajoute au tracker le fond de la carte
     String prefix1 = System.getProperty("user.dir") +
                            System.getProperty("file.separator")
                            + "image"
                            +System.getProperty("file.separator")
                            + "cartes"
                            +System.getProperty("file.separator")
                            + "Arcalpi.gif";
        fondCarte= getToolkit().getImage(prefix1);
        tracker.addImage(fondCarte, 0);
        // Puis les pico
      String prefix2 = System.getProperty("user.dir") +
                            System.getProperty("file.separator")
                            + "image"
                            +System.getProperty("file.separator")
                            + "picto"
                            +System.getProperty("file.separator")
                            + "P2.gif";


        picImage=getToolkit().getImage(prefix2);
        tracker.addImage(picImage, 0);
        // puis on rajoute
    repaint();
  }

   public void paint(Graphics gc)
       if(picImage != null  && fondCarte != null) {
                  if(g.drawImage(fondCarte, 0,0,this) == false)
System.out.println("Fond carte FALSE");
                 if(g.drawImage(picImage,10,100,this) == false)
System.out.println("Image FALSE");
       }
   }
}

Why i can't load and display correctly the CadreAffichePicto from the
CadreExpo class
what is wrong!!
Thank you for your help!!
Jean-Pierre Ballet