routing question?

Hi Guys
I plan on using routeros as my core router and I want to know how to redirect one of my customers to a page saying they are disabled. Is there a code for that or not?

http://forum.mikrotik.com/t/mikrotik-advertise-url-with-pppoe-environment/35755/1

That’s PPPoE/RADIUS specific but the general idea could be made to work for everything.