Validating
http://www.script-tutorials.com/data-validation-html5/
http://www.itechies.net/tutorials/jscript/jsexample.php-pid-jform.htm
http://www.w3resource.com/javascript/form/javascript-sample-registration-form-validation.php
http://www.javascript-coder.com/html-form/javascript-form-validation.phtml