Class Not Found Error Doesn't Make Sense

Possible answer to CNF Exception problems.
I have written a simple slide show applet that displays a sequence of jpgs. In order to make it work for the majority of people and older systems I used the AWT Applet rather than the JApplet framework.
I compiled it using the latest JDK 1.4.1, ran it using applet viewer and locally inside my web browser (IE 6.0) and it all worked fine.
I uploaded it to a web-server, tested it and received a Class Not Found exception. After a few hours of checking, rechecking (code= codebase= etc. etc.) I decided to use an older version of the JDK to compile the applet (since the code was compatible). The oldest I could find was 1.1.8, so I compiled, uploaded and it works on every computer I've tried???
What is the problem here?? Windows 98, the 1.4.1 JDK, IE 6.0?? Has anyone had similar problems before? Why did it work locally but not online?

Hi.
Instead of using the old JDK you can also compile your code for a specific version with
javac -target 1.1 MyApp.javaCheers,
kelysar

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