셀렉트문 부탁합니다.

//// select.php
<select name="wr_1" id="wr_1">
	<option value="">선택하세요</option>
	<option value="기술팀">기술팀</option>
	<option value="영업팀">영업팀</option>
</select>
<select name="wr_2" id="wr_2">
	<option value="">선택하세요</option>
	<option value="기술팀">기술팀</option>
	<option value="영업팀">영업팀</option>
</select>

<script src="https://code.jquery.com/jquery-1.8.3.min.js"></script>
<script>
$("#wr_1").change(function() {
	var val = $(this).val();
	$.ajax({
		type: 'POST',
		url: './ajax.select.php',
		data: {
			wr_1: val
		},
		success: function(data) {
			$("#wr_2").html(data);
		},
		dataType: 'html'
	});
});
</script>



//// ajax.select.php
<?php
include_once("./_common.php");
$wr_1 = escape_trim($_POST['wr_1']);

$sql = "SELECT		*
		FROM		셀렉트불러올테이블
		WHERE		wr_1 = '{$wr_1}'";
$rst = sql_query($sql);
while($row = mysql_fetch_assoc($rst)) { ?>
	<option value="<?php echo $row['wr_2']?>"><?php echo $row['wr_2']?></option>
<?php }