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Determining Java Plug-in status and version

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Does anyone know how a browser can determine if the Java Plug-in is installed and then what version is installed? We have an applet that requires a minimum of the 1.2.2 JRE. If someone doesn't have the plug in, I want to direct them to a page with instructions on how to install the plug-in. However, if they already have the 1.2.2 JRE, I just want to let them know that the 1.3 is available. I saw some JavaScript that might be helpful, but I needed the JRE plug-in's ActiveX name.
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