var how_many_ads = 5;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;

if (ad==1) {url="http://stillme.info/"; alt=""; banner="http://i38.tinypic.com/10mrept.jpg"; width="88"; height="31";}
if (ad==2) {url="http://www.smasheddreams.net/"; alt=""; banner="http://i86.photobucket.com/albums/k97/natasha_b7/SelenaGomez1.jpg"; width="88"; height="31";}
if (ad==3) {url="http://www.guavaburst.net/"; alt=""; banner="http://i26.tinypic.com/2vln1gx.png"; width="88"; height="31";}

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