게시글 엑셀 다운시에 한글이 깨짐

<?header( "Content-type: application/vnd.ms-excel" );header("Content-Disposition: attachment; filename=file.xls");header("Content-Description: PHP4 Generated Data"); include "_common.php"; if($_POST['chk_wr_id']) {	$in = implode(", ", $_POST['chk_wr_id']);	$where = "WHERE wr_id IN($in)";}?><table border="1">	<tr>		<td>참가신청항목</td>		<td>이름</td>		<td>성별</td>		<td>생년월일</td>		<td>연락처</td>		<td>e-mail</td>	</tr><?$que = sql_query("SELECT * FROM g4_write_".$_POST['bo_table']." ".$where);while($row = sql_fetch_array($que)) {?>	<tr>		<td><center><?=$row['wr_2']?></center></td>		<td><center><?=$row['wr_subject']?></center></td>		<td><center><?=$row['wr_3']?></center></td>		<td><center><?=$row['wr_1']?>-<?=$row['wr_4']?>-<?=$row['wr_5']?></center></td>		<td><center><?=$row['wr_name']?>-<?=$row['wr_6']?>-<?=$row['wr_7']?></center></td>		<td><center><?=$row['wr_content']?></center></td>	</tr><?}?></table>