How to Show Only the Month and Year in Jquery Datepicker

I have created a report search form that filter the monthly record of sales. So I don't really care about the specific day but the month.

Jquery has a nice DatePicker library, but it can't be customized to remove the month part, so just hide it with this code:

 $(".monthPicker").datepicker({
  dateFormat: 'yy-mm',
  changeMonth: true,
  changeYear: true,
  showButtonPanel: true,

  onClose: function (dateText, inst) {
    var month = $("#ui-datepicker-div .ui-datepicker-month :selected").val();
    var year = $("#ui-datepicker-div .ui-datepicker-year :selected").val();
    $(this).val($.datepicker.formatDate('yy-mm', new Date(year, month, 1)));
  }
});

$(".monthPicker").focus(function () {
  $(".ui-datepicker-calendar").hide();
  $("#ui-datepicker-div").position({
    my: "center top",
    at: "center bottom",
    of: $(this)
  });
});

Note: While I customized the code to my liking, it's not my original. It came from several google source.