Applet dont work in java runable browser

This is the HTML file i wrote. The class Start.class
is in the same folder but if i call the HTML page there arrives a message class Start.class not found. Maybe it�s really trivial but i cant find a solution. Can anybody help me?
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=windows-1252">
<TITLE>JBuilder-Projekt haus.jpr</TITLE>
</HEAD>
<BODY>
<APPLET code= "Start.class" width="800" height="600">
</APPLET>
</BODY>
</HTML>

Does your class implements Applet or JApplet ?
I have the same problem when using JApplet, It only runs with appletviewer but no in a browser.

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