Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/mocktrial/www/new/about/about.php:6) in /home/hosting_users/mocktrial/www/new/common.php on line 6

이런오류가 뜨는데요
아무리 해봐도 오류가 안없어집니다 ㅠㅠ
소스 올리겠습니다
<?
include_once("./_common.php");
include_once("$g4[path]/lib/outlogin.lib.php"); // outlogin() 함수를 사용하여야 하므로 이 프로그램을 포함시킵니다.
?>
<table width="219" border="0" cellspacing="0" cellpadding="0" class="sub_left">
<tr>
<td valign="top" style="padding-bottom:20px;">
<?=outlogin("basic1"); // 외부 로그인 ?>
</td>
</tr>
<tr>
<td valign="top">
<!-- left menu -->
<table width="219" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><img src="../images/left/left1_title.gif" width="219" height="23" /></td>
</tr>
<tr>
<td align="center" class="left_menu1">
<table width="213" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><a href="/about/about.php" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image11','','../images/left/left1_1_ov.gif',0)"><img src="../images/left/left1_1.gif" name="Image11" width="213" height="23" border="0" id="Image11" /></a></td>
</tr>
<tr>
<td height="1" bgcolor="C58E8E"></td>
</tr>
<tr>
<td><a href="/about/list.php" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image12','','../images/left/left1_2_ov.gif',0)"><img src="../images/left/left1_2.gif" name="Image12" width="213" height="23" border="0" id="Image12" /></a></td>
</tr>
<tr>
<td height="1" bgcolor="C58E8E"></td>
</tr>
<tr>
<td><a href="/about/contact.php" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image13','','../images/left/left1_3_ov.gif',0)"><img src="../images/left/left1_3.gif" name="Image13" width="213" height="23" border="0" id="Image13" /></a></td>
</tr>
<tr>
<td height="1" bgcolor="C58E8E"></td>
</tr>
<tr>
<td><a href="/about/connection.php" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image14','','../images/left/left1_4_ov.gif',0)"><img src="../images/left/left1_4.gif" name="Image14" width="213" height="23" border="0" id="Image14" /></a></td>
</tr>
<tr>
<td height="1" bgcolor="C58E8E"></td>
</tr>
<tr>
<td><a href="#" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image15','','../images/left/left1_5_ov.gif',0)"><img src="../images/left/left1_5.gif" name="Image15" width="213" height="23" border="0" id="Image15" /></a></td>
</tr>
<tr>
<td height="1" bgcolor="C58E8E"></td>
</tr>
<tr>
<td><a href="#" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image16','','../images/left/left1_6_ov.gif',0)"><img src="../images/left/left1_6.gif" name="Image16" width="213" height="23" border="0" id="Image16" /></a></td>
</tr>

</table></td>
</tr>
</table>

<!-- left menu -->
</td>
</tr>
<tr>
<td align="center" valign="top" style="padding:25px 0;">
<!-- -->
<table width="213" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="1" bgcolor="C58E8E"></td>
</tr>
<tr>
<td><img src="../images/left/left_banner_title.gif" width="213" height="19" /></td>
</tr>
<tr>
<td height="1" bgcolor="C58E8E"></td>
</tr>
<tr>
<td><img src="../images/common/left_banner_img.gif" width="213" height="166" /></td>
</tr>
</table>
<!-- -->
</td>
</tr>
</table>