title: j-query date-picker does not work after post back
body: <p>I have a j-query date-picker that does not work after the first post back.  It only works before the post back but the date-picker does not work after post back.  the text-box that shows the date-picker is wrapped with ajax update panel.  here is my j-query:</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
      $().ready(function () {
          $('.date-picker').mousedown(function () {
  
              $('.date-picker').datepicker({
                  changeMonth: true,
                  changeYear: true,
                  showButtonPanel: true,
                  dateFormat: 'MM yy',
                  onClose: function (dateText, inst) {
                      var month = $("#ui-datepicker-div .ui-datepicker-month :selected").val();
                      var year = $("#ui-datepicker-div .ui-datepicker-year :selected").val();
                      $(this).datepicker('setDate', new Date(year, month, 1));
                  }
              });
          });
      });
  &lt;/script&gt;
  &lt;style type="text/css"&gt;
  .ui-datepicker-calendar {
      display: none;
      }
  &lt;/style&gt;
  </code></pre>