What access to you have to the web server, and are you doing your own web site programming ?
What you are after is most definitely possible. It's just that, if you have root access to the Web Server, then you can do it yourself, or you can get someone to implement something for you.
I know I found a web site for people who implement this kind of project, can't find it right now...
Okay, take a look at this site
And see if they provide what you want.