Java Applets not working in New Versions of Java

I have developed a chat program using Applets(developed using jdk1.2),using a Server.Everything is perfectly working.Now,On my client machine i installed jdk1.4, and when i try to download the same applet it is giving Applet ClassNotFound Exception?.
I have just set the class path to jdk1.4.And trying to call the applet from a browser.
IS there any changes in writing the applets using the new version of Java?
Kindly let me know.
Thanks & Regards.,
Naveen Kumar

Sorry can't use em anymore.
ah, ... perhaps not.
What class is not found?

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