function muestraOcultaCapa() {
    if (document.getElementById("fondoTransparente").style.display != "block") {
        document.getElementById("fondoTransparente").style.display = "block";
        document.getElementById("capaLogin").style.display = "block";
    }
    else {
        document.getElementById("fondoTransparente").style.display = "none";
        document.getElementById("capaLogin").style.display = "none";
    }
}