function checkie8(url) {
  var rv = -1;
  var ua = navigator.userAgent;
      var re = new RegExp("Trident\/([0-9]{1,}[\.0-9]{0,})");
      if (re.exec(ua) != null) {
          rv = parseFloat(RegExp.$1);
      }
     if (rv == 4)
        window.location = url
}