all you can do as far as i know is to get his/her ip address by doing a whois search and report it to his internet provider..
they will not treat this as very serious....
any other info you can provide will be helpful..
when you joined the site...
the name of the admin of the site
hope that helps
unless someone else can help as well
____________Mods and themes for Icy Phoenix 1.3
IcyPhoenix UK is off-line permanently due to lack of time to update mods.
if anyone is interested in my templates I will upgrade them to Icy 2.0.