Select a virtual desktop with the size of 800x600, else the picture is shifted to the bottom.
Cd into the Joost directory then run wine xulrunner/tvprunner.exe application.ini
You won't be able to exit the client cleanly as the icon in the notification area does not seem to react to mouse clicks when in virtual desktop mode,
so you need to enter you account name and password every time running joost.
Tested with patches applied to git version wine-0.9.41-63-g96937e0 (17.07.2007)