Well, there are a number of things that could be causing this little program to not function correctly.   The biggest problem is that Netscape's and Microsoft's "applet accelerators" seem to take some shortcuts they shouldn't be taking, and the effect on the code is not unlike the effect on JPEGs when the compression is too high:   It just doesn't cut it.   So, ever since version 3 beta 4 of Netscape Navigator, and version 4.0 of µsoft's IE, Java applets have not behaved at all like they do in Sun's JDK; or µsoft's Internet Explorer 3.0, Sun's HotJava, or even Netscape's browsers on UNIX.   Very soon an Amiga browser that supports Java will be available.   I do hope it functions properly....

It had come to be my theory that Netscape's primary programmer had been promoted.   I felt that this would explain the sudden loss of functionality in what had been turning out to be a keen browser.   Later, I discovered that that was apparently precisely what happened.   Following is a list of things that Netscape Navigator was able to do in previous versions, but not since:

Please forgive my pontification.   :^)
To my main drag or Cut to the chase