How to force the browser to uninstall the older version of plugin?

Hi
The application I am working installs the plugin from its server rather than installing from sun's site when the user opens the page first time. But I want to have all the users use the same version of plugin(because the application loads some libraries as plugin extension).
If any of the user has older version of plugin installed already I want the browser to uninstall the older version and install the newer version from the web server automatically.
Have any one come across this situation?
Thanks.

Isn't that a potentially dangerous thing to allow an applet to do? If you are developing for a company intranet, have your admin do it on all company computers. But if this is a commercial application, I am sure most users won't want an applet uninstalling programs from their computer.
Bart

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