while(true){
aleatorio = Math.random();
numero = Math.round(aleatorio * 4);

if (numero == 0){
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break;}

if (numero == 1){
imagen = "https://i.servimg.com/u/f19/19/15/45/84/jun_un10.jpg";
break;}

if (numero == 2){
imagen = "https://i.servimg.com/u/f19/19/15/45/84/sarah_10.jpg";
break;}

if (numero == 3){
imagen = "https://i.servimg.com/u/f19/19/12/64/28/header10.png";
break;}

}
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