How to check Java Version while showing applet in browser?

Hello All,
We have an application which has client and server mechanism.
Our application can be accessed by any internet browser on any machine of the network but there is only one server in the network.
One of the functionality in the application is described below.
We do have one link in our application webpage. When user clicks on that link, the request goes to the server component which is running on different machine. Now server process the request and in responce we do show some images in applet window at the customer webpage.
Now problem is, when the client machine browser has some lower version of Java, we are not able to show the image but only shows a blank page.
What we want to do is to show some specific warning message when we find that the Java version at client machine is lower than required.
Can anybody please let me know how can I achieve this?
Thanks in Advance,
Jenish

Sun's latest versioning solution for applets and JWS apps. is [deployJava.js|http://java.sun.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html]. I also offer the [Java Version Checker Applet|http://pscode.org/jre.html] as an alternate way of ensuring a minimum major version of the JRE.

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