Animation in GUI

Please Help! Cant figure this out.
I am trying to rewrite a program given to me from my professor. I have a few days to figure this out. Time is running out. A program out of our books called REBOUND.java and our objective is to have the happyface to start and stop onclick. I rewrote the program and is as follows...

Code:

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//**********************************************************************
//  ReboundPanel.java              Java Foundations
//
//  Represents the primary panel for the rebound program.
//**********************************************************************

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ReboundPanel extends JPanel
{
        private final int WIDTH = 300, HEIGHT = 100;
        private final int DELAY = 20, IMAGE_SIZE = 35;
       
        private ImageIcon image;
        private Timer timer;
        private int x, y, moveX, moveY;
       
        //-------------------------------------------------------------------
        //  Sets up the panel, including the timer for the animation
        //-------------------------------------------------------------------
       
        public ReboundPanel()
        {
                timer = new Timer(DELAY, new ReboundListener());
               
                image = new ImageIcon ("happyface.gif");
               
                x = 0;
                y = 40;
                moveX = moveY = 3;
               
                setPreferredSize (new Dimension(WIDTH, HEIGHT));
                setBackground (Color.black);
                timer.start();
        }
       
        //--------------------------------------------------------------------
        //  Draw the image in the current location
        //--------------------------------------------------------------------
       
        public void paintComponent(Graphics page)
        {
                super.paintComponent(page);
                image.paintIcon(this,  page, x, y);
        }
       
        //*********************************************************************
        //  Represents the action Listener for the timer
        //*********************************************************************
       
        private class ReboundListener implements ActionListener
        {
                //******************************************************************
                //Updates the position of the image and the possibly the direction
                //of the movement whenever the timer fires an action event.
                //******************************************************************
                public void actionPerformed (ActionEvent event)
                {
                        x += moveX;
                        y += moveY;
                       
                        if (x <= 0 || x >= WIDTH-IMAGE_SIZE)
                                moveX = moveX * -1;
                       
                        if (y <= 0 || y >= HEIGHT-IMAGE_SIZE)
                                moveY = moveY * -1;
                        repaint();
                }
        }
}

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I cant seem to see the happyface it is suppose to have in the GUI. can some one please help me get this figured out.
Thanks in advance