Finally, I can do the little hack to fix the problem
(1) Open /www/www/plugins/system/jfbcsystem/jfbcsystem.php
(2) Go to Line 158 : change
script type="text/javascript"
into
script type="text/javascript" JFBConnect
(3) Such that the GKParser fail to delete the JFBConnect Javascript... cox they only target for
script type="text/javascript"
I have spend 2 weeks to communicate with the Gavick team...but now I can fix the problems with this little trick in 2 mins...so happy