These are very handy for providing messages to people using HTML5 compliant browsers. I agree, though, that they do not replace server side validation. Other commenters mentioned older browsers and hackers, but tools like firebug and the developer console in Chrome make this useless for validating if you want to be safe about data you鈥檙e putting into your database. look my website: #http://www.haoyinbao.com/bbs/forum.php?mod=viewthread&tid=2894318&extra=