As it was an uncaught exception, I was able to catch it in a global 
handler.  Not a great solution, but it works.

<script type="text/javascript">
  window.onerror = function myErrorHandler(errorMsg, url, lineNumber) {
    if (navigator.appVersion.indexOf("MSIE 7.") != -1) {
      alert("Sorry, IE7 is not supported.");
    } else {
      alert("An unexpected error occurred: " + errorMsg);
    }
    return false;
  }
</script>


Any better ideas will be much appreciated.  :-)

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