Hi. I am using Perl/JS/HTML for a multi-user project also requiring login/passwd authentication, and I have a similar problem. I write my cookies in Perl manually, and a small hand-written parser to evaluate them. I know there is no extra code going in there, but cookies written in JS are not over-written by my Perl cookies. In fact, I get TWO cookies, lexically identical keys, with different values. Somehow the browser knows which is which. Same problem on IE and Opera. Not sure about FF.