Do you have this app in your facebook profile?

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<html>
  <head>
    <title>Has App?</title>
  </head>
  <body>
  <tal:let define="session_key request/fb_sig_session_key|nothing;
                   uid request/fb_sig_user|nothing">
    <tal:if condition="session_key">
      Yes. You have the app
    </tal:if>
    <tal:if condition="not:session_key">
      No. You haven't the app
    </tal:if>
  </tal:let>
  </body>
</html>