You have not included the
jQuery UI CSS file. Try this:
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
1. First include the jQuery UI css file.
2. Next the jQuery latest js file.
3. Next the jQuery UI js file.
Hope this helps!