Adding //<![CDATA [ //]]> within the script should solve the problem. I think this is because there is a script within a script.
Code:
<script type="text/javascript">
//<![CDATA[
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("\<script src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'>\<\/script>" ));
//]]>
</script>
Hope this helps.