Thank you very much. You where right. It wasnt any difficult. I just have to change the config.php and punt www.prescott.edu.pe instead of just prescott.edu.pe. Now its working OK. Im only having problems with images, maybe because of the URLs. But this is not really a problem. I can handle it.
Its true that Im checking it now inside my LAN, and I dont know how it looks form outside, but I have to suppose that its working fine too. Isnt it?