// esta funcion centra el zoom de la imagen, teniendo en cuenta el tamaño de la pantalla
function popup(url) {
    w = 350;
    h= 350;
    w += 32;
    h += 96;
    wleft = (screen.width - w) / 2;
    wtop = (screen.height - h) / 2;
    
    if (wleft < 0) {
        w = screen.width;
        wleft = 0;
    }
    if (wtop < 0) {
        h = screen.height;
        wtop = 0;
    }
    var win = window.open(url,name,'width=' + w + ', height=' + h + ', ' + 'left=' + wleft + ', top=' + wtop + ', ' +
                                     'location=no, menubar=no, ' +
                                     'status=no, toolbar=no, scrollbars=no, resizable=no');
 
    win.resizeTo(w, h);
    win.moveTo(wleft, wtop);
    win.focus();
    return false;
}



function popupEscuchar(url,ancho,alto){
    w =ancho;
    h= alto;
    w += 12;
    h += 36;
    wleft = (screen.width - w) / 2;
    wtop = (screen.height - h) / 2;
    
    if (wleft < 0) {
        w = screen.width;
        wleft = 0;
    }
    if (wtop < 0) {
        h = screen.height;
        wtop = 0;
    }
    var win = window.open(url,name,'width=' + w + ', height=' + h + ', ' + 'left=' + wleft + ', top=' + wtop + ', ' +
                                     'location=no, menubar=no, ' +
                                     'status=no, toolbar=no, scrollbars=no, resizable=no');
 
    win.resizeTo(w, h);
    win.moveTo(wleft, wtop);
    win.focus();
    return false;
}