Hmm... In order to have a counter or guestbook work, you need to be able to modify a file on a server somewhere to remember what has already been entered. Javascript cannot do this.

In both of the cases offered by Nesh, this was not done through javascript. In the first case, it was done through email, and in the second, through a CGI script. These are the actions that are taken when the form is submitted (hint- check the action element of the form tag). The javascript just does input validation before you submit.

It's easy to get a counter; it just has to be hosted on a machine which allows CGI scripts. such counters are freely available on the web, such as here

The only way for you to get a guestbook working is to either find an email based guestbook system and run a cron job or something that updates the guestbook when you get new mail, update the guestbook by hand yourself when you get the email, or find someone else to host your guestbook on a machine which hosts guestbooks. I haven't heard of such a thing, probably because guestbooks require a lot more resources than a counter, and people want to have more control over how they work.