this plug-in check the required fields before visitor submiting the comment, and show nice message notice him about the error also highlight the requi
* Validate the required fields without reloading the page. * Show the error message in nice way. * Ability to change the error message. * Ability to change the error style. * You donít have to edit any of the WordPress files.
Thereís an arabic version of this plugin, you can find it here: http://swanderer.ws/wordpress-plugins/plugin-comment_fields_js_validation-ar/.