IE ChromeFrame conditional prompt and alert

_ie_warning.html

    <!--[if lt IE 7]>
    <script type="text/javascript" 
   src="http://ajax.googleapis.com/ajax/libs/chrome-frame/1/CFInstall.min.js"></script>
    <script>
     // The conditional ensures that this code will only execute in IE,
     // Therefore we can use the IE-specific attachEvent without worry
     window.attachEvent("onload", function() {
       CFInstall.check({
         mode: "overlay"
       });
     });
    </script>
    <![endif]-->

    <!--[if lt IE 9]>
    <div class="alert-message warning">
    <span class="icon-reminder"></span>
      Our site works best in <a href="http://browsehappy.com/">modern browsers</a>.
      We recommend upgrading or installing the
      <a href="http://www.google.com/chromeframe">Google Chrome Frame</a> plugin for the best experience.
    </div>
    <![endif]-->

how did you configure the page head to correspond to this?

I configured it per the ChromeFrame docs, the standard:

I tested in browserstack and it worked as I expected.