How to find out if JRE is installed on a Win32 system?

Hi,
does anyone know a good and reliable way to find out if JRE is installed on a Windows system? I want to start a JAR file but don't want to appear the "select program to start with"-chooser box when there's no JRE. Most unexperienced users give up at this point and delete my application. I'd rather let a popup-message appear that says something like "You need Java - download it here for free ...<link>".
Maybe a script file? Or a small C++ program that only checks if Java is installed and then starts the application (or gives out the popup). And how to check for an existing JRE?
I know about Webstart but have no server at hand...
Thanks!!!

Try JSmooth ( http://jsmooth.sourceforge.net/ ). It's a Java executable wrapper.
From the website:
When the user clicks on the .exe, the windows application search the most suitable JVM installed on the computer to launch the java application. If no JVM is found, a dialog box is displayed to the users and they may be redirected to a web site (to www.java.com for example).
Even if you don't use it as it is you can learn from it, because JSmooth is Open Source.

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