var hasMsgr = false;

function ymsgrIsWindows() {
  return navigator.platform == "Win32";
}

function ymsgrIsMSIE() {
  return !window.opera && document.all;
}

function ymsgrIsOverMSIE6() {
  return ymsgrIsMSIE() && document.compatMode;
}

if (ymsgrIsWindows()) {
  if (ymsgrIsMSIE()) {
    if (ymsgrIsOverMSIE6()) {
      document.write('<object classid="clsid:E8C37621-8D22-11d3-A703-00508B33FB82" ID="Ymsgr" width="0" height="0">');
      document.write('<span id="yj_nomsgr"></span>');
      document.write('</object>');
    } else {
      hasMsgr = true;
      document.write('<object classid="clsid:E8C37621-8D22-11d3-A703-00508B33FB82" ID="Ymsgr" width="0" height="0" codebase="javascript:hasMsgr = false">');
      document.write('</object>');
    }
  }
}

function isMsgrInstalled() {
  return (ymsgrIsOverMSIE6() && !document.all['yj_nomsgr']) || hasMsgr;
}