Posted 02 October 2009 - 02:05 PM
It doesn't even need to be fancy...
"I agree that from <date> forth I am responsible for all updated and alterations to <name of website>. I also agree that my contract with <your name or company name> to <list of contracted services> is void, and that <your name or company name> is released from all responsibility. Further, I agree that <name of website> is functional to my complete satisfaction, and that <your name or company name> has fulfilled their contractual obligations. "
That is just off the top of my head, but is something that I would use. You may want to also have a witness sign the contract also.