Image not updating on repaint

So the file image.png is getting overwritten every 2 seconds. I want an applet to display the image in a browser. It does display the image, but the problem is the image never gets updated in the applet after the image file was updated on the computer. What am I doing wrong?

import java.awt.*;  
import java.util.Timer;
import java.util.TimerTask;

import javax.swing.JApplet;

public class ImageUpdate extends JApplet {  

  Image picture;  
  Timer timer = new Timer();
  int delay = 2000; //2 second
  int period = 4000; //4 seconds

  public void init() {  
    picture = getImage(getDocumentBase(),"image.png");  

    timer.scheduleAtFixedRate(new TimerTask() {
          public void run() {

             repaint();

              System.out.println("image updated");
          }
        }, delay, period);      
  }  

  public void paint(Graphics g) {
      g.drawImage(picture, 0,0, this);     
    }        

  public void update(Graphics g) 
  { 
      super.paint(g);

  } 
}

Solution

Gave up on the applet, and did it in html and JavaScript. It works so much better this way. Thanks Andrew. I had really wanted to get the applet to work, but ... whatever.

<html>

<head>
<script language="JavaScript"><!--
  function refreshIt() {
    if (!document.images) return;
      var date = new Date();
    document.images['image'].src = 'http://localhost:8080/image.jpg?ts=' + date.getTime();
      setTimeout('refreshIt()',2000); // refresh every 2000ms
 }
  //--></script>
</head>

<body onLoad=" setTimeout('refreshIt()',2000)">

<img src="http://localhost:8080/image.jpg" name="image">

</body>

</html>