Submit simples de formulário em ajax

submit-formulario.js

$('#id-do-formulario').live('submit', function() {
  var form = $(this);

  if (form.data('submitting')) {
    return false;
  }

  form.data('submitting', true);

  var config = [];
  config['url'] = form.attr('action');
  config['data'] = form.serialize();
  config['type'] = 'post';

  $.ajax(config)
    .complete(function(jqXHR, textStatus) {
      form.data('submitting', false);

      switch (textStatus) {
        case "error" :
        case "timeout" :
        case "abort" :
        case "parseerror" :
          // ERRO
          break;

        case "success" :
        case "notmodified" :
          // MANIPULE O jqXHR.responseText E VEJA SE DEU ERRO OU FOI OK
          break;
      }
    });

  return false;
})
.find('.bt-submit').live('click', function() {
  $(this).parents('form').trigger('submit');
  return false;
});