var how_many_ads = 3;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
//alert("VAL: " + ad);
if (ad==1) {
alt="AMA"; banner="images/loop_1.jpg";
width="572";
height="221";
}
if (ad==2) {
alt="AMA"; banner="images/loop_2.jpg";
width="572";
height="221";
}
if (ad==3) {
alt="AMA"; banner="images/loop_3.jpg";
width="572"; height="221";
}

document.write('<center>');
document.write('<img src=\"' + banner + '\" width=')
document.write(width + ' height=' + height + ' ');
document.write('alt=\"' + alt + '\" border=0><br>');
document.write('</center>');