this.CreateMonthGrid = function(theYear, theMonth, theDay){ //refresh the month view to the date, main action is run this.setDayList() and set this.Source.value
    var theTextObject = this.Source;
    if (theTextObject == null){
      return;
    }
    var theName = this.Name;
    var theYearObject = document.all.item(theName + "_YearList");
    var theMonthObject = document.all.item(theName + "_MonthList");
    var tmpYear = theYear;
    var tmpMonth = theMonth;
    var tmpDay = 1;
    if (tmpMonth < 0){
      tmpYear--;
      tmpMonth = 11;
    }
    if (tmpMonth > 11){
      tmpYear++;
      tmpMonth = 0;
    }
    if (tmpYear < this.MinYear){
      tmpYear = this.MinYear;
    }
    if (tmpYear > this.MaxYear){
      tmpYear = this.MaxYear;
    }
    if (theDay < 1){
      tmpDay = 1;
    }else{
      tmpDay = this.GetMonthDays(tmpYear, tmpMonth);
      if (theDay < tmpDay){
        tmpDay = theDay;
      }
    }
    theYearObject.value = tmpYear;
    theMonthObject.value = tmpMonth;
    this.setDayList(tmpYear, tmpMonth, tmpDay);
    theTextObject.value = this.SetDateFormat(tmpYear, tmpMonth, tmpDay);
    theTextObject.select();
  }
  this.UpdateMonthGrid = function(theObject){ //run this.CreateMonthGrid() by theObject
    var theTextObject = this.Source;
    if (theTextObject == null){
      return;
    }
    var theName = this.Name;
    var theYearObject = document.all.item(theName + "_YearList");
    var theMonthObject = document.all.item(theName + "_MonthList");
    var theDayObject = document.all.item(theName + "_DayList");
    var tmpName = theObject.id.substr(theObject.id.lastIndexOf("_"));
    switch (tmpName){
      case "_goPreviousMonth": //go previous month button
        theObject.disabled = true;
        this.CreateMonthGrid(parseInt(theYearObject.value, 10), parseInt(theMonthObject.value, 10) - 1, parseInt(theDayObject.value, 10));
        theObject.disabled = false;
        break;
      case "_goNextMonth": //go next month button
        theObject.disabled = true;
        this.CreateMonthGrid(parseInt(theYearObject.value, 10), parseInt(theMonthObject.value, 10) + 1, parseInt(theDayObject.value, 10));
        theObject.disabled = false;
  &