Not much more to say, I'm sure you master this kind of encryption now.
Well, in order to reward your great work (even if I said there would be nothing to win :), here is a link where you can get the original RC4 encryption source. Oh yes, you did not guessed it yet ? The encryption scheme I used on those page is a 'light' version of the well-know RC4 scheme.
I'm sure you'll find lots of way to use this encryption scheme, not only in your web pages, but mainly to protect your confidential data files against undesirable readers :) Actually, I don't think that this encryption method brings anything more than the one used, for example, on the last level of the multi level Javascript challenge you can found somewhere else on Sandman's pages. In both cases, the actual page name is completely hidden and cannot be found anywhere.
I want to thank you for spending your precious time on this Javascript challenge (which was both my first javascript and html writing). I hope you learned something, as I did while writing it :) Please feel free to email me with any comments, suggestions or even how you found the right password.