How can I encrypt JavaScript code so that it's not decryptable?

Question

I have some JavaScript code I need to encrypt, but I want to be sure no one can decrypt it.

What tools can I use to do this?

-- Edit --

Answer 1

I don't think you want encryption, unless you're going to write a browser extension that can decrypt the javascript.

I thing GWT, or even jsmin can sufficiently compress / obfuscate your javascript for normal use.

If you want to tie some client side code to your site, you may want to consider some sort of a random handshake that depends on a server-side method to 'validate' the javascript. I don't even know if that's feasible though.