[CentOS] Problems to install java plugin in CentOS 5.1 x86_64

Hi!

I've tried to install java plugin as is in 
http://www.howtoforge.com/installation-guide-centos5.1-desktop-p7 but with no 
success.

All steps seems to go well, with no error messages, but Firefox says that 
there is no java plugin.

Please, tell me what could be wrong?

Thanks in advance!!
-- 
Sergio Belkin
----------------------------------------