Image on frame

Hi,

This is my code. In this I am unable to load the image.I want to know the problem with this code.

import java.awt.*;
import java.awt.event.*;
public class AwtImg extends Frame
{
    Image img;
    public static void main(String args[])
    {
        AwtImg ai=new AwtImg();
    }
    AwtImg()
    {
        super("Image Frame");
        MediaTracker mt=new MediaTracker(this);
        img=Toolkit.getDefaultToolkit().getImage("swamiji.jpeg");
        mt.addImage(img,0);
        setSize(400,400);
        setVisible(true);
        addWindowListener(new WindowAdapter(){
          public void windowClosing(WindowEvent we){
          dispose();
          }
       });
      }
         public void update(Graphics g){
  paint(g);
  }

  public void paint(Graphics g){
  if(img != null)
  g.drawImage(img, 100, 100, this);
  else
  g.clearRect(0, 0, getSize().width, getSize().height);
  }

}

Thank You

srihari