How to make onSelect for sertain date at Keith Wood datepicker plugin?

How to make onSelect for sertain date at Keith Wood datepicker plugin?

For example, how to make an alert only for Jan 7 and Oct 31?
I did next but it did not work:

     var christmas = new Date(2013, 1 - 1, 7);
     var halloween = new Date(2012, 10 - 1, 31);

 
     $(function() {
 $('#inlineDatepicker').datepick({
              onSelect: function(christmas) { alert('The chosen date: ' + christmas); },
               onSelect: function(halloween) { alert('The chosen date: ' +  halloween); },
         });
      });