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

if (numero == 0){
imagen = "http://i43.tinypic.com/33z6wlw.png";
break;}

if (numero == 1){
imagen = "http://i44.tinypic.com/29psx08.png";
break;}

if (numero == 2){
imagen = "http://i41.tinypic.com/2mw8575.png";
break;}

if (numero == 3){
imagen = "http://i44.tinypic.com/141qck5.png";
break;}

if (numero == 4){
imagen = "http://i42.tinypic.com/106bwxj.png";
break;}

}
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