How can I detect if a customers browser supports Java?

I have numerious websites using a Java e-commerce program called U-Shop. I have customers that do not have Java enabled or installed that cannot see the Java Applets on the site and leave the site because they don't think they can shop-on line. Most of them have no idea what Java even is...
Is there a way I can detect if they do not have jave enabled and take them to a separate page on the site that can explain what they need to do to get Java, or link them directly to a url where they can get Java installed?
I am not a programmer, but do know html very well, so be gentle :)
Thanks for any help you can provide...
Jeff Grant
www.aswebsales.com

You could display a [start] page that would redirect the user whether he supports/applets java applets or not. This page could look like:
<html>
<head>...</head>
<body>
<applet ...>
**** You can put here the HTML code for the clients that ****
**** cannot use java applets ****
</applet>
</body>
</html>
The applet in this page could simply issue a command like
getAppletContext().showDocument(...);... to redirect the client to another page dedicated to clients able to use applets.

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