Any real time dynamic functionality like that which goes back and forth
between the browser (client) and the web site (server) (a client-server
transaction) requires web programming. You can use technology like ASP.Net
(visit http://www.asp.net) and build your own or optionally you can use
someone elses that they make available. A popular source for pre-programmed
web site tools is http://www.bravenet.com/ .  To use such just follow their
instructions for incorporating them in your existing site.

David Bartosik - [MSFT MVP]
http://www.publishermvps.com
http://www.davidbartosik.com