var how_many_ads = 2; var now = new Date() var sec = now.getSeconds() var ad = sec % how_many_ads; ad +=1; if (ad==1) { button='

'; } else if (ad==2) { button='

'; } else { button=''; } document.write('

'); document.write(button); document.write('

'); document.write('

'); document.write('

'); document.write('

'); document.write('

'); document.write('

'); document.write('

'); document.write('

');