Hey Rap,
Firstly, lets clear up some terminology. There is no corollary between Java and Javascript. In fact, the only real thing they have in common is the first four letters of their name. The Java language was invented by Sun Microsystems as a cross-platform development application language. Javascript was developed by Netscape Systems as a subset of the ECMAScript specification to bring dynamic programmability to web pages.
With that out of the way, what exactly are you asking for? If you are looking for applications for writing and testing Javascript, there are tons out there. I personally prefer Visual Studio (as I'm a computer programmer and used to it). Barring that, I use Notepad++. To test and debug scripts, I typically just use the Developer Tools and error consoles built into most modern browsers.
If that doesn't help, leave me a PM with what you are trying to figure out and I'll try to help.
Thanks!
-- Esk
