Creating a moving banner using a Java Applet without threads

Question

I was wondering how to create a moving banner using Java Applets without threads. I got it this far but the program doesn't repaint.

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

/*<applet code="bt" height=300 width=300></applet>*/

public class bt extends Applet{
    String msg="This banner is soo cool!!!";
    String hm;
    char c;

    public void init(){
        setBackground(Color.cyan);
        setForeground(Color.red);
    }

    public String bann(String mg){
        c=mg.charAt(0);
        hm=mg.substring(1,mg.length());
        hm+=c;
        repaint();

        return hm;
    }

    public void paint(Graphics g){

        try{
            for( ; ; ){
                g.drawString(msg,100,100);
                Thread.sleep(2000);
                msg=bann(msg);
            }
        } catch(InterruptedException e) {}
    }
} 

Moreover, i can't close the window by just clicking exit. I have to force Quit it. It would be nice if someone could explain why.