you can get the java runtime environment here, the bin file is about 15mb
http://java.sun.com/j2se/1.5.0/download.jsp
once you have downloaded the file you need to change it to be executable by opening a terminal and:
cd /path-to-bin-file
chmod a+x /path-to-bin-file/jre1_5_0.bin
./jre1_5_0.bin
this should install the jre plugin to make it work with firefox you need to still be in terminal and:
cd /path-to/firefox/plugins
once you're in the plugins directory you need to create a link to the jre plugin which is called libjavaplugin_oji.so you do this by typing:
ln -s /path/to/plugin/libjavaplugin_oji.so
once thats done you should double check in Firefox edit > preferences that the enable java checkbox has been checked and that should be you.
RealPlayer can be downloaded at
http://www.real.com/linux/
This is my first time at replying to a query and i would like to know if it helped you out, also to you guru's out there have i explained this correctly?