function sendRegData(f){
   var msg = '';
   for (var i=0; i < f.elements.length; i++){
      if (f.elements[i].name.substring(0,3) == 'reg' && f.elements[i].value == ''){
          alert('Fill all fields to continue');
          return;
      }
   }
   if (f.reg_pwd.value != f.reg_pwd2.value){
      alert('No match in your password and confirmation.');
      return;
   }
   if (f.reg_pwd.value.length < 6){
      alert('The password is very short, write a password more great.');
      return;
   }
   f.submit();
}