y=0;
ad=new Array(y);
var bnum=new Number(Math.floor(99999999 * Math.random())+1);

ad[y++]='<IFRAME FRAMEBORDER=0 MARGINWIDTH=0 MARGINHEIGHT=0 SCROLLING=NO WIDTH=160 HEIGHT=600 SRC="http://www.efiro.com/contenido/horoscopo-y.html"></IFRAME>'

x = Math.floor(Math.random()*(y));

document.write(ad[x]);