Can't figure out Firefox Plugin Requirement

[Tech Writer]

I'm using Firefox in Red Hat EL5, and trying to run a web application that requires a Java Virtual Machine. When I start my application, I get an informational message that "additional plugins ar required".  When I click the "Install Missing Plugins" button, it directs me to the java web site, where I downloaded the file:  jre-1_5_0_11-linux-i586.rpm.  I installed this, went back into Firefox, and back to the java website, where I did a "verify installation".  All appears good (the verify worked).  Yet... I'm STILL getting the message that I'm missing the JVM plugin.

Any ideas?
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