function blink(elId){
        var html = '';
        if(document.all){
          html += 'var bl = document.all.' + elId + ';';
        }
        else if(document.getElementById){
          html += 'var bl = document.getElementById("' + elId + '");';
        }
        html += 'bl.style.visibility = ' + 'bl.style.visibility == "hidden" ? "visible" : "hidden"';
        if(document.all || document.getElementById){
          setInterval(html, 800);
        }
      }
      function init(){
        blink('blnk');
      }
      onload=init;