while(true){
    aleatorio = Math.random();
    numero = Math.round(aleatorio * 14);

    if (numero == 0){
    imagen = "http://img6.imagebanana.com/img/jennkje1/header1.png";
    break;}

    if (numero == 1){
    imagen = "http://img6.imagebanana.com/img/n7et29mz/header2.png";
    break;}

    if (numero == 2){
    imagen = "http://img7.imagebanana.com/img/wmnp0r02/header3.png";
    break;}

    if (numero == 3){
    imagen = "http://img7.imagebanana.com/img/6xka2997/header8.png";
    break;}

    if (numero == 4){
    imagen = "http://img7.imagebanana.com/img/1x30ogc0/header4.png";
    break;}

    if (numero == 5){
    imagen = "http://img7.imagebanana.com/img/kzrarscc/header6.png";
    break;}

   if (numero == 6){
    imagen = "http://img7.imagebanana.com/img/65e9272s/header7.png";
    break;}

   if (numero == 7){
    imagen = "http://img6.imagebanana.com/img/ey0eg1qu/header5.png";
    break;}

   if (numero == 8){
    imagen = "http://img7.imagebanana.com/img/w0gpclgc/header9.png";
    break;}

   if (numero == 9){
    imagen = "http://img7.imagebanana.com/img/cwoiq2s7/header10.png";
    break;}

   if (numero == 10){
    imagen = "http://img6.imagebanana.com/img/s6g93skq/header11.png";
    break;}

   if (numero == 11){
    imagen = "http://img7.imagebanana.com/img/96mhneea/header12.png";
    break;}

   if (numero == 12){
    imagen = "http://img7.imagebanana.com/img/zy1wv34p/header13.png";
    break;}

   if (numero == 13){
    imagen = "http://img6.imagebanana.com/img/s1kjkeic/header14.png";
    break;}


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