function on() {
    document.getElementById("overlay").style.display = "block";
}

function off() {
    document.getElementById("overlay").style.display = "none";
}

//$(document).keyup(function(e) {
//    if (e.key === "Escape") { // escape key maps to keycode `27`
//        off()
//    }
//});

function desactivarOverlays(IdOverlays){
    for( idOverlay in IdOverlays){
         $("#" + idOverlay).hide();
    }
    off();
}

function activarContenidoOverlay(IdOverlays, idOverlay, idlabel, label){
    desactivarOverlays(IdOverlays);

    if(!(idlabel==undefined))
        $("#" + idlabel).html(label);

    on();

    $("#" + idOverlay).show();
}