var how_many_ads = 3;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;

if (ad==1) {
url="linkpromotion.php";
alt="LinkPopularity promotion service!";
banner="banners/bannerlp.jpg";
width="468";
height="90";
}
if (ad==2) {
url="http://www.stormpay.com/?2159594";
alt="EuroTraffic";
banner="banners/banner-5-euro.gif";
width="468";
height="60";
}
if (ad==3) {
url="http://www.catlist.com";
alt="Adult Service!";
banner="banners/19tube.gif";
width="468";
height="60";
}

document.write('<a href="' + url + '" target="_blank"><img src="' + banner + '"alt="' + alt + '" style="border:0px;"></a><br />');