var how_many_ads = 1;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads ;
ad +=1;




if (ad==1)
document.writeln('<iframe allowtransparency=true src=http://www.codigobarras.com/share-ht/jedis/ad_tpl.php?ic=1957&amp;r=10008 width=728 height=90 frameborder=0 marginwidth=0 marginheight=0 scrolling=no align=middle></iframe>');

if (ad==2)
document.writeln('<iframe src=http://www.parquesdeatracciones.net/Publi-Grupo/taller-728x90.htm width=728 height=90 frameborder=0 marginheight=0 marginwidth=0 scrolling=no></iframe>');