title: jquery datepicker flicker issue
body: <p>When I enable following options</p>
  
  <pre><code>        changeMonth: true,
          changeYear: true,
  </code></pre>
  
  <p>clicking on button/input field causes whole or a part of page to clicker. It happens only in FF. Any idea what is going on?</p>
  
  <p>Thanks, Pawel</p>