The easisest way to do it with mozilla is
1) Go to a site that has a Java Applet in it (www.bbc.com
, for example)
2) Mozilla will prompt you for Java
3) Say ok
4) It will redirect you to a page where there are 4 buttons...click the one for Linux
5) The installation will be automatically done and everything willbe set up on the fly
Hope that helps....