LTSP and MAC address

Hi,

I'm setting up a Linux server with (linux)thin clients, LTSP -
www.ltsp.org.
It works fine! But I want the server to show on every client onother
htmlpage. So when a terminal session is started the server has to
decide witch htmlpage to send based on the MAC address of the client.
But I have no idee how to do this. Is there anyone how has done this
before? I there anyone who knows how to setup a similair situation?

Regards Sjaak Hamers