After burning my fingers, adding and putting and extracting, re installing jres and jdks.
I started from the beggining deleting all the class files from the browser cache.
and came back to this basic html applet tag code.
<applet code="Testjapplet.class" archive="testjapplet.jar" width="500" height="500"></applet>
the applet came to life. (thanks to this I could revive an old applet).
This are the point to be considered when you want to run an applet.
One JVM. I deleted all of them and installed a brand new one.
recompiled your application with the latest JDK. (consider refactoring your application)
build into a jar file, (keep it neat)
if you ftp to your server, make sure you use binary transfer
make sure you clear you cache in your browser, Firefox for example, will keep loading the applets.
in this case, the applet class is in not in a package.
Sometimes we go around in circles with simple things, and we are embarrased to ask.
I hope it helps.