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()",1000)
}
window.onload = startBlink;