Please Help! Can't get my applet to work!!

PLEASE HELP
I have been trying to get an applet to work which when viewed in an applet viewer works fine.
HOWEVER, when I try to view it through the browser it will not be viewed. The html code I've used is very simple and you can see that below . I've downloaded the JAVA plugin but that doesn't work either!
The errors that come up say --- java.lang.ClassFormatError.Class already loaded
Then if the window is expanded says --- java.lang.NoClassDefFoundError:javax/swing/JApplet
I haven't a clue what's wrong!!
HTML CODE
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<HTML>
<HEAD><TITLE>Chess Game
</TITLE>
</HEAD>
<BODY>
<applet Code ="ChessClient20.class" Width =450 Height =555>
</applet>
</BODY>
</html>
Thanks for any help!!

Thanks, have now found original mail. I think I've lost the plot. will check out those suggestions.

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