Double buffering problem

I'm learning animations and have followed every possible tutorial I could find, but still my simple "animation" flickers.
First I tried to do a bouncing ball animation (three .gif frames), now I simply copied the code of this tutorial and tried to animate a moving car. It still flickers.
The Java Boutique: Java Tutorial: Java by Example: Fonts and Graphics - Page 20
I modified it a bit (instead of
Image car=getImage(getCodeBase(), "car.gif");
I use ImageIcon class to load my image and since I don't have a background image I clear the buffergraphics with clearRect(0,0,width, height))
The applet looks good on the website, but in eclipse it flickers a lot (as it does without the double buffering).
Here is my code, thanks for your help.

Code:

---

import java.awt.*;
import java.applet.*;
import javax.swing.ImageIcon;

public class flickerTest extends Applet implements Runnable
{
        Thread runner;
        private Image Buffer;
        private Graphics gBuffer;
        String filePath="...";
        Image car = new ImageIcon(filePath+"/car.gif").getImage();
        int x=0;

       
        public void init()
        {
                //create graphics buffer
                Buffer=createImage(getWidth(),getHeight());
                gBuffer=Buffer.getGraphics();
  }

        public void start()
        {
              if (runner == null)
              {
                          runner = new Thread (this);
                          runner.start();
              }
        }

        public void stop() {
  runner = null;
        }

        public void run()
        {
                while(true)
                {
                        //Thread sleeps for 15 milliseconds here
                        try {Thread.sleep(15);}
                        catch (Exception e) {//
                           
                        }
                       
                        gBuffer.clearRect(0, 0, getHeight(), getWidth());

                        //move the car from left to right...
                        x++;

                        //if it moves past the right border,
                        //let it reappear on the left border
                        if(x>getWidth())
                              x=-125;

                      gBuffer.drawImage(car,x,150,null);
                   
                      repaint();
                }
        }

  //is needed to avoid erasing the background by Java
  public void update(Graphics g)
  {
                paint(g);
  }

  public void paint(Graphics g)
  {
    g.drawImage (Buffer,x,0, null);
  }
}

---

Well this was aggravating. I used another program to create the .gif image and now it works perfectly. Go figure.
Previously I used a program called Pixen, now I opened the image and saved it in GIMP and it started working miraculously.:@::(party):