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

if (numero == 0){
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break;}

if (numero == 1){
imagen = "http://i55.tinypic.com/2mm66va.jpg";
break;}

if (numero == 2){
imagen = "http://i54.tinypic.com/5zf6fn.jpg";
break;}

if (numero == 3){
imagen = "http://i56.tinypic.com/n4w083.jpg";
break;}

if (numero == 4){
imagen = "http://i54.tinypic.com/zxmpuw.jpg";
break;}

if (numero == 5){
imagen = "http://i52.tinypic.com/295v1xi.jpg";
break;}


}
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imagen + '" border=0 style="width: 800px; height: 300px"></a>');