var how_many_ads = 4;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
txt="";
url="http://www.elojodelfuego.com.ar";
alt="El Portal de la Cultura Platense";
banner="ojo.gif";
width="468";
height="60";
}
if (ad==2) {
txt="";
url="http://www.mercadolibre.com.ar/argentina/ml/pms?site=234964&id=4026&go=CA";
alt="Ofertas";
banner="http://pms.mercadolibre.com/cgi/pms/ban?site=234964&id=4026";
width="468";
height="60";
}
if (ad==3) {
txt="Publicite AQUI";
url="http://www20.brinkster.com/graciasmaestro/contacto.asp";
alt="Publicite AQUI";
banner="public.gif";
width="468";
height="60";
}
if (ad==4) {
txt="";
url="http://link.bannerlandia.com.ar/r/2485/1?1.3;468;60";
alt="Visite el auspiciante";
banner="http://banners.bannerlandia.com.ar/s/2485/1?1.3;468;60";
width="468";
height="60";
}
document.write('<center>');
document.write('<a href=\"' + url + '\">');
document.write('<img src=\"' + banner + '\" width=')
document.write(width + ' height=' + height + ' ');
document.write('alt=\"' + alt + '\" border=0><br>');
document.write('<small>' + txt + '</small></a>');
document.write('</center>');