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, 2500);
  }
}

function init(){
  blink('blink1');
	blink('blink2');
}
onload=init;