function blinky(){
  var delay = 750;
  var el = document.body.getElementsByTagName('img');
  for (var i = 0; i < el.length; i++){
    if (el[i].className == 'start'){
      el[i].style.visibility = el[i].style.visibility == 'hidden' ? 'visible' : 'hidden';
    }
  }
  setTimeout('blinky(' + delay + ')', delay);
}
function fillit(){
  var newuri = 'images/input-background-alert.gif';
  document.getElementById("myp").style.backgroundImage = 'url('+newuri+')';
  setTimeout("refillit()",2000);
}
function refillit(){
  var uri = 'images/input-background.gif';
  document.getElementById("myp").style.backgroundImage = 'url('+uri+')';
}