http://jqueryvalidation.org/

CDN:
http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/jquery.validate.js
http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/jquery.validate.min.js
http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/additional-methods.js
http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/additional-methods.min.js
