var docid = null;
  var interval = 1000;
   function blink()
  {
   var el = document.getElementById(docid);
    if (typeof el != 'undefined' && el)
    {
       vis = (el.style.visibility == 'visible') ? 'hidden' : 'visible';
       el.style.visibility = vis;
       setTimeout("blink()", interval);
     }

  }

  window.onload = function()

  {
    docid = 'sblink';

    interval = 500;

    setTimeout("blink()", interval);

  }