<script>
      $(document).ready(function() {
        $('.show-phone').on('click', function(){
          $.ajax({

            url: '../config/contact_settings.php',
            data: {action: 'phone'},
            method: 'POST',

            success: function(result) {
              $('.phone-number').html(result);
            }

          });
        });

        $('.show-email').on('click', function(){
          $.ajax({

            url: '../config/contact_settings.php',
            data: {action: 'email'},
            method: 'POST',

            success: function(result) {
              $('.email-address').html('Skrzynka e-mail: ' + result);
            }

          });
        });

      });
    </script>