$(document).ready(function() {
      $('#submit_btn').click(function(){

        var dataString = $('#contact_form').serialize();
        $.ajax({
          type: "POST",
          url: 'send_form_email.php',
          data: dataString,
          dataType: 'json',
          success: function(data) {
            if(data.success == 0) {
              if(data.name_msg != '')
                $('#name_msg').html(data.name_msg);
              if(data.email_msg != '')
                $('#email_msg').html(data.email_msg);
              if(data.email_msg != '')
                $('#message_msg').html(data.message_msg);
            }
            else if(data.success == 1)
            {
              $('#name_msg').html(data.name_msg);
              $('#email_msg').html(data.email_msg);
              $('#message_msg').html(data.message_msg);

              $('#contact_name').val('');
              $('#contact_email').val('');
              $('#contact_message').val('');

              $('#success_message').show();
            }

          },
          error: function() {

          }
        });

        return false;
      });
    }
    );