Javascript or CSS problem?

After upgrading to WP 3.9, I’m having a minor problem with the search function on my calendar of events page at http://whiskycast.com/?p=10992. When a user clicks the search button to bring up the dialog, the popup window with various search parameters comes up with no background…before the upgrade, it had a white background similar to that on our tasting notes page at http://whiskycast.com/?p=10819.

Here’s the code for the search function on the calendar page:

<button id="search_tasting">Search</button>
<div id="tasting_dialog" style="display: none;">[events_search]</div>
<script src="../wp-content/plugins/jquery-ui-1.10.0.custom/js/jquery-1.9.0.js"></script><script src="../wp-content/plugins/jquery-ui-1.10.0.custom/js/jquery-ui-1.10.0.custom.min.js"></script><script>// <![CDATA[
$(document).ready(function() {      $("#search_tasting").button().click(function() {            $('#tasting_dialog').dialog({modal: true});      }); });
// ]]></script>

This was created for us by a former contractor, and I’m not sure whether the background for the search popup window is part of the Javascript or the CSS. Any Javascript experts out there who might have a suggestion?

Thanks!

Mark