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





if (ad==2)
document.writeln('<iframe src=http://www.imagenesanimadas.net/arriba1-468x60.asp width=468 height=60 frameborder=0 marginheight=0 marginwidth=0 scrolling=no></iframe>');

if (ad==1)
document.writeln('<iframe src=http://www.imagenesanimadas.net/arriba2-468x60.asp width=468 height=60 frameborder=0 marginheight=0 marginwidth=0 scrolling=no></iframe>');