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

if (ad==1) {
url="http://www.justedge.net/dedicated_servers.php";
alt="JustEdge Dedicated Servers";
banner="http://www.justedge.net/af/banners/justedge-728x90.gif";
width="728";
height="90";
}

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