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)
}
window.onload = startBlink;