Security Basics: Anti-Phishing with digital watermarking

[Alcides <alcides.hercules () gmail com>]

Hi All,

Recently came across some interesting text while reading about 
anti-phishing techniques, that can be implemented server-side.
-----------------<snip>------------------------------------
If we insert something like obfuscated java-script in the original website
[which alerts us when run under any URL other than the authentic]
we can get alerted against these attacks.
-----------------<snip>------------------------------------

Wish to know more on the subjects. May be few sample codes. Googled 
around quite a lot but it looks tough to find anything closer to 
practical possibilities.
Any help, links, pointers including free/ commercial options all welcome.

Thanks a lot.

Cheers!