sebastian schreef:
> Can this be done without client-side scripting? I thought sessions
> might be the answer but after some testing found that sometimes the
> old session data remained even after the user left the site and
> returned. Just had an idea, though. Perhaps I could access the users
> Referrer header?

Hi Sebastian,

I think you cannot detect this without JavaScript.
If somebody goes somewhere else, your server is not notified.
You can only try this via JavaScript.

Referer:
And I don't see how the Referer header can help you out.
It is send to the next site (if send at all).

Session:
No go either.
A Session is nothing more than a piece of data on the server that is
linked to a certain visitor via a PHPSESSID (via cookie/url/form).
I don't see how they can help you with this.

So bottomline, bad luck.
You need JavaScript (or some other clientside technology, like an JAVA
applet).

Regards,
Erwin Moller