// JScript 파일
function ChangeMonth(yname, mname, dname)
{
	var objYY = document.all[yname];
	var objMM = document.all[mname];
	var objDD = document.all[dname];

	var nYear = parseInt(objYY.options[objYY.selectedIndex].value, 10);
	var nMonth = parseInt(objMM.options[objMM.selectedIndex].value, 10);
	var nDay = parseInt(objDD.options[objDD.selectedIndex].value, 10);

	while (objDD.options.length)
		objDD.options.remove(0);

	var newOpt;

	for (var i=1; i<=DaysInMonth(nYear, nMonth); i++)
	{
		newOpt = document.createElement("OPTION");
		newOpt.text = (i > 9 ? "" : "0") + i;
		newOpt.value = newOpt.text;
		objDD.options.add(newOpt);
	}

	if (nDay <= objDD.options.length)
	{
		objDD.options[nDay-1].selected = true;
	}
	else
	{
		objDD.options[objDD.options.length-1].selected = true;
	}

	return false;
}