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$('input[name="fromDatepicker"], input[name="toDatepicker"]').change( function(){
      d1 = $('input[name="fromDatepicker"]').datepicker('getDate');
      d2 = $('input[name="toDatepicker"]').datepicker('getDate');
      diff = 0;
      if (d1 && d2) {
            diff = Math.floor((d2.getTime() - d1.getTime()) / 86400000); // ms per day
      }
      $('input[name=days]').val(diff);
});