Library Style wifi login web site

Greeting

About a mounth or so ago a friend wanted to set up a computer resource centre, and asked me to set it up.

We installed 6 computers in one area and a wifi area down stairs. We are using Bell's Speedstream Wifi router, linked to a Trendnet Wireless router, which is linked to the 6 computers VIA two Linksys BEFSR41 routers.

All is running ok, but my friend wants the people using the computers to log in, like they do in Librarys, where you go to one of the computers or wifi connection and ask for a time on one of the computers. the system then tells you which computer to use, and gives you a number to use and computer to log on to.

My question is. Is there a freeware program that does this? Of so where can I get it from.

Thanks in advance
sparkie4080@gmail.com