With Firefox 11.0 an applet fails to call back to JavaScript with 7u5
and 6u33, yet the user-visible applet behavior is in this case
for some reason.
   
   - This applet worked fine with 7u3

   - still works fine in MSIE 9 64 bits with 7u5
(MSIE 9 also fail with 6u33)

   - Fail on FireFox 11 and Chrome 19
   
   - the user-visible applet behavior is in this case for some reason.
   

 The Java console trace is attched (java_console.log)