Human face using applet programming

import java.applet.*;
import java.awt.*;

public class Chatterjee extends Applet
{
public void init()
{

}
public void paint(Graphics g)
{
g.drawOval(40,40,120,150);
g.drawOval(57,75,30,30);
g.drawOval(110,75,30,30);
g.fillOval(68,81,10,10);
g.fillOval(121,81,10,10);
g.drawLine(100,100,100,117);
g.fillRect(60,139,80,10);
}
}




In da above program,I would like to see the lips which is rectangle change to arc on clicking...or it should turn into smilimg face........How do I proceed using ActionListener..........pls explain....