getting the icon back to the header

hi.
i want to put an icon in the header(like  the fox icon in the FF browser etc.) instead of the Java icon.
i tried something out,but for now, i only managed to remove the icon at all... :-S
my code looks like that (not all of it, just the parts needed here...)

public class BootStrap
{      static String ImageIconFolder;
      static ImageIcon tPointerLogo;
      public BootStrap(String timageIconFolder,ImageIcon pointerLogo){
            ImageIconFolder=timageIconFolder;
            tPointerLogo=pointerLogo;
      }
    public static void main(String args[])
    {      String ImageName="\\PointerLogo.jpg";
          String ImageFolder="C:\\Temp";
          String ImageIconFolder=ImageFolder.concat(ImageName);
        tPointerLogo = new ImageIcon(ImageIconFolder);

        new LoopSMS("Loop SMS    Ver. 1.01");
       // LoopSMS.setIconImage(PointerLogo.getImage());
    }
}

...      //constructor
    public LoopSMS(String frameTitle)
    {
        super(frameTitle);
           //initialise components
        init();
           //construct GUI
        construct();
          //Display GUI
        display();
    }

  private void construct()
    {
        ImageIcon PointerLogo = new ImageIcon();
        PointerLogo=BootStrap.tPointerLogo;

      //  JFrame MainFrame = new JFrame("Loop SMS Ver. 1.01");
      this.setIconImage(PointerLogo.getImage());
    //    MainFrame.setLocationRelativeTo( null );
       this.getContentPane().add(this.MainFramePanel);
       // MainFrame.add(MainFramePanel);
        MainFramePanel.add(DLPanel);
    ....}

how do i fix that?