function blink(speed) {
  
  if (speed) {
    if (document.all)
    setInterval("blink()", speed*3000)
    return;
  }

var blink = document.all.tags("BLINK")

for (var i=0; i<blink.length; i++)
  blink[i].style.visibility = blink[i].style.visibility == "" ? "hidden" : ""
  
}