var how_many_ads = 3
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
var imagelocations="../jpg/small/"
ad +=1;
   
if (ad==1){   
img_loc=imagelocations + "gaj_small.png";
alt="alt1";   
}
   
   
if (ad==2) {   
img_loc=imagelocations +"placement_small1.png";
alt="alt2";   
}
   
if (ad==3) {   
img_loc=imagelocations +"placement_small2.png";
alt="alt3";   
}

if (ad==4) {   
img_loc=imagelocations +"placement_small3.png";
alt="alt3";   
}  
document.write('<img src=\"' + img_loc + '\"')
document.write('alt=\"' + alt + '\">');