var how_many_ads =1;
var now = new Date();
var sec = now.getSeconds();
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
var msg4="<iframe frameborder=0 scrolling=no src=http://www.wallpaperspecials.com/ad-vid.php width=600 height=100></iframe>"
document.write(msg4)
}