Java upgrade from 1.5.0_14 to the latest

Hi All
I have some questions regarding Java upgrade on Red Hat 5.
I have Red Hat Enterprise Linux Server release 5 (Tikanga).
I Also have Source RPM: jdk-1.5.0_14-fcs.src.rpm installed under /usr/java/.
My questions are as follwo:
1.Is the latest Java rpm file name that I need to install is "jre-6u14-linux-i586-rpm.bin"
2.I would like to keep the java 1.5.0_14 in order to have the option to rollback how do I install the newest Java ? .
What are the steps for the installation ?

Regards
Shai