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;