function blinky(delay) {
  var el = document.body.getElementsByTagName('SPAN');
  for (var i = 0; i < el.length; i++) {
   if (el[i].className == 'blink') {
    el[i].style.visibility = el[i].style.visibility == 
     'hidden' ? 'visible' : 'hidden';
   }
  }
  setTimeout('blinky(' + delay + ')', delay);
}