Use CDATA tag around the MathJax script.
</menu>
<head>
- <script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
- </script>
+ <![CDATA[<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" />]]>
</head>
</body>
