Internet Explorer Strikes Again

Just found out my Radar Chart Google Spreadsheet Gadget did not work on all popular browsers.  Guess which one?!

The error message was:

window.G_vmlCanvasManager is null or not an Object

I swear I had verified it working on Internet Explorer before.
I swear I had not made any change since.
and I swear...
and I swear...

Apparently, there was a problem loading excanvas.js (a javascript to enable HTML5 canvas for Internet Explorer).  As a result, window.G_vmlCanvasManager did not exist.

My original code was:

<content type="html"><![CDATA[

<!--[if IE]><script type="text/javascript" src="http://hosting.gmodules.com/ig/gadgets/file/115560173853763482292/excanvas.js"></script><![endif]-->

<script src="http://www.google.com/jsapi" type="text/javascript"></script>

As it turns out, there needs to be something between <![CDATA[ and the conditional comment <!--[if IE]>... even if it is just a <p> or another <script> line.

So I changed the code to:

<Content type="html"><![CDATA[

<script src="http://www.google.com/jsapi" type="text/javascript"></script>

<!--[if IE]><script type="text/javascript" src="http://hosting.gmodules.com/ig/gadgets/file/115560173853763482292/excanvas.js"></script><![endif]-->

The gadget is working once again.