[gamera]

<script>
	$(function() {

		$("#form_status_added").click(function () {
			var number_data = $("#form_data_number").text();
			number_data++;
			$("#form_data_number").html(number_data);
			
			$("<div class='param'><select name='input_name[10]' id='month' onchange='days()'><?php echo $monthOptions; ?> </select></div>" ).insertBefore("#form_status_added");
		
	})		 });
	</script>

	<?php
    $monthOptions = '<option value="0">Месяц</option>';
    $dayOptions = '<option value="0">День</option>';
    $yearOptions = '<option value="0">Год</option>';
	$monthName = array(null,"Январь","Февраль","Март","Апрель","Май","Июнь","Июль","Август","Сентябрь","Октябрь","Ноябрь","Декабрь");
    foreach ($monthName as $key){
	for($month=0;$month<count($key);$month++)
	{  
	$monthName = date("F", mktime(0, 0, 0, $month));
	$monthOptions .= "<option value=\"{$month}\">{$key}</option>\n";
	}}
	for ($day=1;$day<=31;$day++)
	{
	$dayOptions .= "<option value=\"{$day}\">{$day}</option>\n";
	}
	for ($year=2013;$year>=1920;--$year)
	{
	$yearOptions .= "<option value=\"{$year}\">{$year}</option>\n";
	}
	?>
<script type="text/javascript">
	 function days() {
	 var monthSel = document.getElementById('month').value;
	 var daySel = document.getElementById('day');
	 var dayInmonth = 31;
	 if (monthSel == 2)
	 {
	 dayInmonth = 29; 
	 }
	 else if (monthSel == 4 || monthSel == 6 || monthSel == 9 || monthSel == 11) 
	 {
	 dayInmonth = 30;
	 }
	 if (daySel.options.length > daysInmonth)
       {   
	   daySel.options.length = daysInmonth;
       }
       while (daySel.options.length != daysInmonth)
       {   
	   daySel.options[daySel.length] = new Options(daySel.length+1, daySel.length+1, false);
       }
       return;
    }
	</script>

вот другой код, но опять не выводится функция