Hello,
Here’s a multiplayer Tetris game we did a while back
great implementation of the great game, but did’nt have anyone to play with on multiplayer! 
Something very very broken about that page, I suggest you stop using that JSP crap and just use a “normal” link.
Or, to put it another way, it told me I had to download a “plugin” and opened a new window to sun’s site. Several hundred java apps I run on here from day to day rather strongly suggest that yes, I do have java installed.