Applet is viewed by appletviewer but not browser

Hello All:
I have created several applets, and they all can be viewed by appletviewer. Some of them can be viewed by both appletviewer and the browser, and I have Internet Explorer. I realized that if in an applet a class extends JApplet, then that applet cannot be viewed by the browser but appletviewer let you view it. Classes in all the other applets extends Applet, and these applets will easily be viewed by both browser and the appletviewer. Could someone please let me know what the problem is? My guess is the platform setting. The platform is J2EE, and each applet and the related files such as html file containing applet tag, etc are in the same directory.
Thanks,

it shows up and when i click it shows the mouse position if i somehow refresh the screen (like move some window over the applet )
it should be repainting but doesn't seem to either... and it doesn't seem to be reading from the file... but all this works fine with the appletviewer...
udam

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