Okay, so I've been trying to install a JRE on 10.04. I followed the instructions here

Code:
ghacks.***/2010/05/21/install-java-on-ubuntu-10-04/

(*** = net; sorry, can't paste links yet)
exactly. Everything seems fine until I come to the section on configuring Java for Firefox. Inputting the java -version command returns

Code:
java version "1.6.0_20"
OpenJDK Runtime Environment (IcedTea6 1.9.8) (6b20-1.9.8-0ubuntu1~10.04.1)
OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode)
However, the locate libjavaplugin command returns nothing, and the files and directories mentioned in the Firefox section of that tutorial seem to not exist in my /usr/lib/jvm/java-6-sun-1.6.0.24/jre directory. The only thing in this directory is a folder called desktop, which contains two files: sun_java.desktop and sun_java.png.

I thought it might be an issue because I'm running a 64-bit version of 10.04, but I'm not sure.