function ocultarPromo() {
    document.getElementById('flotante-wrapper-centro').style.display = "none";
    document.getElementById('fondo-promo').style.display = "none";
    return false;
}
function mostrarPromo() {
    document.getElementById('flotante-wrapper-centro').style.display = "";
    document.getElementById('fondo-promo').style.display = "block";
    return false;
}