while(true){
aleatorio = Math.random();
numero = Math.round(aleatorio * 5);

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break;}

if (numero == 1){
imagen = "http://img859.imageshack.us/img859/4490/shinsekaibanner.png";
break;}

if (numero == 2){
imagen = "http://img200.imageshack.us/img200/8882/kazukibanner.png";
break;}

if (numero == 3){
imagen = "http://img825.imageshack.us/img825/782/madarabanner.png";
break;}

if (numero == 4){
imagen = "https://i.servimg.com/u/f67/16/27/27/25/banner10.png";
break;}


}
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