jportable java autoupdate disable

I'd like to distribute a web app that needs a java plugin on the browser,
so I have downloaded portableapps with ironportable and jportable.

Everything works fine but it seems that both ask for updates.

I've find the way (via command line switches) to force the browser to work only with our site so there isn't any need of update for security reasons.

I don't want that users update the java plugin.

At the moment I haven't find the way to avoid java plugin to search for updates.

Could someone help me ?

Many thanks and sorry for my English.