your script code is being added before the jquery code is included you have to put your script code after it
Currenttly looks like:
<script type="text/javascript">
$(document).ready(function(){
$("ul#nav_14623").addClass("nav");
});
</script>
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script type="text/javascript" src="/js/bootstrap.js" /></script>
Needs to be
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script type="text/javascript" src="/js/bootstrap.js" /></script>
<script type="text/javascript">
$(document).ready(function(){
$("ul#nav_14623").addClass("nav");
});
</script>