Applet works on applet viewer but not in html, why not?

I'm using Eclipse as a development system and the Eclipse applet viewer shows my applets with no problem. They work the way I expect them to work and all is well.
When I try to run them in Internet Explorer, I first get a security warning. OK, I trust myself, so I tell Internet Explorer to run the applet. All I get is the text "Hello Dolly", but the applet doesn't run.
I tried refreshing it, running it again, allowing popups and opening the file, but it just won't run. What could be wrong with something so trivial?
Any suggestions would be appreciated.
<html>
<head>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Hello to Everyone</title>
</head>
<body>
<applet CODE="Hello.class" width=300 height=100>Hello Dolly
</applet>
</body>
</html>

Sorry, I didn't think there was anything special in the applet.
This just happens to be what I'm checking at the moment.
It has changed depending upon where in the tutorial I find myself.
Thanks for you help.
It has to be something really stupid that I'm missing, but since I'm still new at this game, I can miss something obvious to everyone else.
package hello;
import java.applet.Applet;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.util.Date;
public class Hello extends Applet implements Runnable {
     private static final long serialVersionUID = 1L;
     Color colors[] = new Color[50];
     Date date1 = null;
     Thread run1 = null;
     Font f1 = new Font("Ariel", Font.PLAIN, 14);
     public void run() {
          int i = 0;
          Thread currThread = Thread.currentThread();
          while (currThread == run1) {
               setForeground(colors);
               repaint();
               i++;
               if( i>= colors.length) i = 0;
               try { Thread.sleep(50); }
               catch (InterruptedException e) {}
     public void init() {
          int i;
          float c = 0.0f;
          for(i=0; i<colors.length; i++) {
               colors[i] = Color.getHSBColor(c, 1.0f, 1.0f);
               c += 0.2f;
     public void start() {
          if (run1 == null) {
               run1 = new Thread(this);
               run1.start();
     public void stop() {
          run1 = null;
     public void paint(Graphics g){
          date1 = new Date();
          g.setFont(f1);
          g.drawString(date1.toString(), 10, 50);

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