Applets doesn't close

Here is the code of an applet to show a face happy and sad at
intervals, I made.

import java.awt.*;
import java.applet.*;
//<applet code=Smiley width=r500 height=500>
public class Smiley extends Applet {
        boolean active=true;
        String msg = "Ravi";
        public void paint(Graphics g) {
                while(true)
                {
                g.drawString(msg,50,50);
                g.drawOval(100,100,220,200);
                g.drawOval(150,165,10,10);
                g.drawOval(250,165,10,10);
                if (active)
                {
                        g.clearRect(185,190,59,59);
                        g.drawArc(185,190,50,50,-30,-120);
                        active = false;
                }
                else
                {
                        g.clearRect(185,190,55,59);
                        g.drawArc(185,230,50,50,30,120);
                        active = true;
                }
                try {
                        Thread.sleep(1000);
                } catch (InterruptedException e) { }
                }
        }
        public void stop() {
                msg = "Java is everywhere";
        }
}

The problem is that applet refuses to close when I click on the close
button present on the title bar of the window.
I use jdk1.6 under Debian GNU/Linux.