A "cookie" might do the trick. A cookie is data you can store in the
client browser through a simple line of CGI code then the next time that
browser comes to your site, you can examine the "cookie"
To learn more about cookies visit my HTML/CGI guide
http://www.cnw.com/~drclue/Formula_One.cgi/HTML/HTMML.html
there is a serach engine on my page. type in the key-word "cookie"
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Dr. Clue (A.K.A. Ian A. Storms)
The InfoBON Management Team
http://www.infobon.com/