/**
  * Check if the fields has same value
  *
  * @param Rabbit_Field $to
  * @return boolean
  */
 public function compare_equals(Rabbit_Field $to)
 {
     $ci =& get_instance();
     $v1 = $this->field->getRawValue();
     $v2 = $to->getRawValue();
     if ($v1 != $v2) {
         $this->message = sprintf($ci->lang->line('rabbit_comparator_equals'), $this->field->getLabel(), $to->getLabel());
         return false;
     }
     return true;
 }