your reference to resources are not proper: either load js/css through CDN or host it locally after downloading them,to observe the change.
As of now change these to see your accordion work
Inside head line no 11
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.4/themes/smoothness/jquery- ui.css">
before body end tag line no 48 49
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>