/*
   function valid email test whether valid email address was used
   credits: http://www.quirksmode.org/js/mailcheck.html
*/

function valid_email(text) {

   var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
   if (filter.test(text)) {
      return true;
   } else {
      return false;
   }
   
}//function valid_mail(text)