/* This is used by the DateDropDownPicker control */
function DatePickerMonthYearChange(dayDropdown, monthDropdown, yearDropdown) {
    var dayControl  = document.getElementById(dayDropdown);
    var monthControl = document.getElementById(monthDropdown);
    var yearControl = document.getElementById(yearDropdown);
    
    var month = monthControl.value;
    var year = yearControl.value;
    
    var daysInMonth = new Date(year, month, 0).getDate();
    
    for (var i=dayControl.options.length;i>daysInMonth;i=i-1)
    {
        dayControl.options.remove(i-1);
    }
    for (var i = dayControl.options.length+1; i <= daysInMonth; i = i + 1) {
        var elOptNew = document.createElement('option');
        elOptNew.text = i;
        elOptNew.value = i;
        dayControl.add(elOptNew);

    }

}