<!-- Principio
var how_many_ads = 5;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
url="imagenes/foto01.jpg";
width="185";
height="360";
}
if (ad==2) {
url="imagenes/foto03.jpg";
width="185";
height="360";
}
if (ad==3) {
url="imagenes/foto04.jpg";
width="185";
height="360";
}
if (ad==4) {
url="imagenes/foto05.jpg";
width="185";
height="360";
}
if (ad==5) {
url="imagenes/foto06.jpg";
width="185";
height="360";
}

document.write('<img src=\"' + url + '\" width=')
document.write(width + ' height=' + height + ' ');
document.write('border=0>');
// Fin -->

