It's not Java that it is dependant on, but rather Javascript - other than the name, the two have nothing in common. I'm not sure about Opera, but IE, Phoenix, and Mozilla all have something along the lines of a checkbox named "Enable scripting", which needs to be enabled for those help pages and windows (such as Fileman) to work.
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com