Works fine for me, of course I don't have anyone's messaging adress, but the page loads and functions fine. Looking at the source, I don't see anything that;s driven by J++ hooks or anything else that would cause problems.
Have you tried re-installing (or installing) the Sun Java plug in?
http://java.com/en/download/manual.jsp
I have the J2SE 1.5 beta installed so it's a little hard for me to judge where you're breaking down, but looking at the source for the page you linked I'd think it has to be the J-script somewhere. There's a little routine to check for browser type and builds a text array from what you type in. I'd imagine that's where you get hung up.
Again, though, works completely fine for me. I believe the current distro of sun java is 1.4.2, that's what you should see in the help about or properties of javaws.exe
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