Gj on the necro!
And BTW Java script is NOT used for hacking. Java Script is used within HTML to make forms. It can in no way be used to make hacks.
Hacking RS is nearly impossible as all the important things are server sided (That's the reason for the no downloading required). Ofcourse you could hack theirs servers, but do you really think you'll get even close to doing that.
The closest things to a hack for RS is RSBot. Which is a bot.
Final note:
GIVE UP THEIR WILL NEVER BE HACKS FOR RUNESCAPE!
Capslock got stuck :]