Posted by Jukka K. Korpela on 09/04/05 10:00

Neredbojias <neredbojias@neredbojias.com> wrote:

> You could do it with javascript, but if the visitor has javascript
> turned off...

Even with JavaScript enabled, it would not work. There is no way in
JavaScript to recognize the user as the same person or other being that
earlier visited the page. Even if you could do that, and you cannot,
you could not know whether he, she, or it visited the page between the two
visits.

If you have password protected pages that require a user id and password,
and if you record all visits, and if you have reliably identified the
people to whom you give an id, and if nobody ever lets anyone else use his
or her id, then you recognize users and visits, and send alternating
content. Of course, the recognition and other logic would need to reside on
the server.

The conditions will not be fulfilled in the sublunar world, however.
Especially the part "nobody ever lets anyone else..." fails.

--
Yucca, http://www.cs.tut.fi/~jkorpela/
Pages about Web authoring: http://www.cs.tut.fi/~jkorpela/www.html

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