title: changing minDate option in JQuery DatePicker not working
body: <p>I have declared a date picker instance as follows:</p>
  
  <pre><code>    $("#datePickerId").datepicker(
      { dateFormat: 'DD, d MM yy',
        minDate: 0,
        showOn: 'button',
        buttonImage: '../../images/calendar.gif',
        buttonImageOnly: true,
        hideIfNoPrevNext: true
      }
     );
  </code></pre>
  
  <p>I now want to change to the minDate option so I do this:</p>
  
  <pre><code>$('#datePickerId').datepicker('option', 'minDate', 3);
  </code></pre>
  
  <p>But nothing happens. Was I suppose to do anything else? What other possible causes could there be?</p>