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)
    }