<script>
var how_many_ads = 3;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
txt="Ingrese al web de Banner1";
url="http://www.banner1.com";
alt="Banner1.com";
banner="images/banner1.gif";
width="468";
height="60";
}
if (ad==2) {
txt="Ingrese al web de Banner2";
url="http://www.banner2.com";
alt="Banner2.com";
banner="images/banner2.gif";
width="468";
height="60";
}
if (ad==3) {
txt="Ingrese al web de Banner3";
url="http://www.banner3.com";
alt="Banner3.com";
banner="images/banner3.gif";
width="468";
height="60";
}
document.write('<center>');
document.write('<a href=\"' + url + '\" target=\"_blank\">');
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>');
</SCRIPT>