I'm on a Windows machine now (
), but from what I've seen on the web, I believe you want to use Finder to go to Applications > Utilities > Java, then run the Java Plugin for the version you're using.
To be honest, I'm not very familiar with Control Panel, and I don't know whether this is available for use with Java 6 Preview. (I wonder if you might actually be looking for the Java Preferences app. This is under Applications > Utilities > Java > [J2SE version].)
Let us know if this helps.
[ July 12, 2006: Message edited by: marc weber ]