How can I check what version of Java Web Start is installed on the client ?

hi,
Can anyone tell me how can I check what version of java web start is installed on the client and display a message if the client has not the good version ?
I mean:
I'd like all people running my application use java 5 and if someone using java 1.4 try to run the application get a nice screen telling him to download the latest version of Java Web Start.
Is this possible ?
Thanks in advance.

Of course, I put this on my jnlp file,
<resources>
    <j2se version="1.5+"/>
    <jar href="..... "/>
</resources> But even with that, it doesn't display a nice message but a kind of exception instead.
Thanks in advance.

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