[mullr]

The first, second, and really all the rules of encryption are that you should not write your own encryption code. And as others have noted, there are fundamental issues with doing such an implementation in Javascript at all.

Please consider the social consequences of pushing encryption which is very likely to be flawed to those who may not know better. If you wish to play (and who doesn't?), then it should be done among people who study cryptography and its implementation for a living.