Well the page where you log in for runescape wont work.. It shows the java logo then disappears.. Ive tried uninstalling java and downloading again and nothing works..
If you are using an out-of-date browser, that might be your problem. If you are using IE6 you should do this: http://runescape.com > Play Now(Not the game, the little bar) > Java options > Force Sun Java.
If you are using FireFox, your Java settings should be "Default Java". If that still doesn't help then do the following.
Mozilla Firefox > Tools > Options > Content > Check both of the boxes that say "Enable Javascript" & "Enable Java". That should solve your problem. If not, sorry. Don't know what to tell you.
You're having an issue with your Java version. Look for another Java applet, see if it runs. If not, try re-installing your browser and/or Java installations.