Java Web Applet Errors

I have been making Java applications for a while and decided that I would teach myself applets. I am going absolutely no where fast. I copied some sample code from the tutorial (Simple.java) and made a simple web page to display it. I keep getting errors like "Invalid bytecode" and the applet cannot be found whenever I try something.
Here is my html:
<html>
<head>
<title>I hate applets</title>
</head>
<body>
<h1>I'm learning applets and failing miserably</h1>
<APPLET code=Simple.class width="200" height="200">
Sorry, I am oblivious.
</APPLET>
</body>
</html>
I have the class file in the same directory as the html file. What am I doing wrong?
Thanks for any help.

An applet class is slightly different from an application class. Better take a look at
http://java.sun.com/developer/onlineTraining/Programming/BasicJava1/applet.html

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