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Detecting Jar file on Local PC

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I have an applet which will use third party JAR file.
Now to avoid downloads, I have one program which will create a directory on users PC and add that path to his classpath.
Now, everything works fine if user did this.
In case user do not install (run) my installation program and try to open the application the applet window just gives the blank screen. How do I catch this condition and give proper message to the user.
In IE in the applet constructor I try to create dummy instance of one of the class from the jar file and I could catch the exception, but in Netscape, the control does not comes to me and before that it prints stack trace in java console.
Any clue.?
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