function daysInMonth(iYear, iMonth) { return 32 - new Date(iYear, iMonth, 32).getDate(); }



function resetTheDays(yearID, monthID, dayID){

	number_of_days_it_should_be = daysInMonth( yearID.value, (monthID.value-1) );

	

	beforeDayValue = dayID.value;

	dayID.length = 0;

	

	dayID.options[dayID.options.length] = new Option("Day", "0");

	dayID.options[dayID.options.length] = new Option("-------", "0");



	for (var x = 1; x <= number_of_days_it_should_be; x++) {

		t_day = x;

		if (x < 10) { t_day = "0"+t_day; }

		the_option_item = dayID.options.length;

		dayID.options[the_option_item] = new Option(t_day, t_day);

		dayID.options[the_option_item].selected = false;

		if (beforeDayValue == t_day ) { dayID.options[the_option_item].selected = true; } 

   	}

}