title: jQuery UI datepicker not showing week numbers
body: <p>My jquery UI datepicker is not showing week numbers, even with the showWeek:true option set. Here is my code:</p>
  
  <pre><code>&lt;script type='text/javascript'&gt;
    $(document).ready(function(){
      $('#startDate').datepicker({ 
        changeMonth: true, 
        changeYear:true, 
        dateFormat: 'd-M-yy', 
        firstDay: 1, 
        showButtonPanel: true, 
        showWeek: true 
    });
  });
  &lt;/script&gt;
  &lt;input type='text' name='startDate' id='startDate'&gt;
  </code></pre>
  
  <p>From what I understand, you ONLY need to set the showWeek option to make this work - the weekHeading has a default of 'Wk' and the calculateWeekNumber has a built in ISO week number calculator function.</p>
  
  <p>Also, for some reason the 'Today' button on the button panel is disabled?! Any advice would be most appreciated. Thanks.</p>