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

if (ad==1) {
alt="Runner 01";
banner="/kaiser/images/photos/01.jpg";
width="250";
height="210";
}

if (ad==2) {
alt="Runner 02";
banner="/kaiser/images/photos/02.jpg";
width="250";
height="210";
}

if (ad==3) {
alt="Runner 03";
banner="/kaiser/images/photos/03.jpg";
width="250";
height="210";
}

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