editar multiselect

function editarMultiselect(valor, multiselect, selector) {
  $(multiselect).find('option').each(function (key, option) {
    if (option.selected) {
      $(multiselect).multiselect('deselect', option.value);
    }
  });
  if (valor) {
    $(multiselect).multiselect('select', valor);
  }
  $(multiselect).multiselect('rebuild');
  $(selector).change();
}