function doBlink () 
{
   var blink = document.all.tags ("BLINK");
   for (var i=0; i < blink.length; i++)
      blink[i].style.visibility = blink[i].style.visibility == "" ? "hidden" : ""; 
}

function startBlink () 
{
   if (document.all)
      setInterval ("doBlink ()", 500)
}