I could not load any of the demo applets.  I do not have jython installated on my PC.  Here is the information you required.

1.What OS (name and version) and Browser (name and version) you are running
    Windows 2000
    Netscape Communicator 4.61

2.A copy of your Java console window after failing to run an applet
    #Applet exception: class HelloWorld could not be loaded

3.The URL of the applet that didn't work for you