[DoLet]

http://php.net/manual/en/book.image.php

http://php.net/manual/en/image.examples-watermark.php

http://php.net/manual/en/image.examp...-watermark.php

http://phpmaster.com/watermarking-images/

http://www.9lessons.info/2011/11/php...watermark.html

http://911-need-code-help.blogspot.c...ext-using.html

Javascript:
http://www.patrick-wied.at/static/watermarkjs/