Hi,
Copyright is not really worth a thing unless you are prepared to invest time and money persuing a claim, which would be difficult enough for a "thief" in the UK nevermind one who is overseas.
All you can do is take whatever staps you can to make it more difficult for the thief.
Im sorry, but rightly or wrongly, at the end of the day if something is on the internet then it is stealable, copyable and any other "able's" you can think of, and there is very little that web owners can do about it without spending a lot of money.
Even the pics in ambriel's site can be stolen (if I use IE so I can actually see them) by doing a screen print and pasting the print into photoshop, where it could be edited, watermark removed etc etc.
Thanks