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Detecting Java Plugin installed in Javascript

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I have been scratching me head alot with attempting to detect the presence of the Java Plugin.

I have tried

if (navigator.javaEnabled) alert('Java Installed')

I have also tried a number of scripts that claim to detect java etc on a wide variety of browers, with no sucess.

I have tried all of these on internet explorer and firefox on my windows xp machine. but with no success and from what i've read most people seem to have problems with detecting java in winxp.

Does anyone know how to detect Java in winxp?


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