Hi. This is the way i solved the problem.
In the software repositories add
http://download.opensuse.org/repositories/Java:/sun:/Factory/openSUSE_Factory to have the sun java plugin, and then search sun in the software tab. Choose the appropriate plugin. Remember to install flash player also.
Now go to the configuration tab and choose scripts. Add these lines to the script that has to be executed at the end of the build :
mkdir /home/tux/.mozilla/plugins
ln -s /usr/lib/jvm/java-1.7.0-sun/jre/lib/i386/libnpjp2.so /home/tux/.mozilla/plugins/
ln -s /usr/lib/browser-plugins/libflashplayer.so /home/tux/.mozilla/plugins/
this example is valid for version 1.7 of sun java, otherwise you will correct the script accondingly to your software selection. Hope this helps