http://www.skistart.com/js/prototype/validation.js
http://www.multitriathlon.se/js/prototype/validation.js
https://www.salden.nl/js/prototype/validation.js
http://www.climbing247.se/js/prototype/validation.js
http://www.sportteam.nu/js/prototype/validation.js
http://kidstuff.com.au/js/prototype/validation.js