var how_many_ads = 4;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;

if (ad==1) {
banner="random/fotosbalk1.jpg";
alt="Pizza Hut";
width="780";
height="108";
}

if (ad==2) {
banner="random/fotosbalk2.jpg";
alt="Pizza Hut";
width="780";
height="108";
}

if (ad==3) {
banner="random/fotosbalk3.jpg";
alt="Pizza Hut";
width="780";
height="108";
}

if (ad==4) {
banner="random/fotosbalk4.jpg";
alt="Pizza Hut";
width="780";
height="108";
}



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