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Warning: Cannot modify header information - headers already sent by (output started at C:\AutoSet\public_html\head.php:1) in C:\AutoSet\public_html\head.sub.php on line 34

Warning: Cannot modify header information - headers already sent by (output started at C:\AutoSet\public_html\head.php:1) in C:\AutoSet\public_html\head.sub.php on line 35

Warning: Cannot modify header information - headers already sent by (output started at C:\AutoSet\public_html\head.php:1) in C:\AutoSet\public_html\head.sub.php on line 36

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페이지 최상단에 저 경고문 문구가 나오는데 그누보드원본 head.php를 쓰면 문제없으나
제가 직접 수정한 head.php만 올리면 저모양이군요.

문제의 head.php 내용은 아래와 같습니다.
------------------------------------------------------
<?
if (!defined("_GNUBOARD_")) exit; // 개별 페이지 접근 불가

include_once("$g4[path]/head.sub.php");
include_once("$g4[path]/lib/outlogin.lib.php");
include_once("$g4[path]/lib/poll.lib.php");
include_once("$g4[path]/lib/visit.lib.php");
include_once("$g4[path]/lib/connect.lib.php");
include_once("$g4[path]/lib/popular.lib.php");

//print_r2(get_defined_constants());

// 사용자 화면 상단과 좌측을 담당하는 페이지입니다.
// 상단, 좌측 화면을 꾸미려면 이 파일을 수정합니다.

$table_width = 889;
?>
<center>
<!-- 상단 배경 시작 -->
<table width="864" cellspacing="0" cellpadding="0">
<tr>
<td style="padding-top:11px; padding-bottom:12px;">
<img src="<?=$g4['path']?>/images/logo_1.gif" width="137" height="48">
</td>
<td style="width:300px; padding-top:42px; float:right;">
<table border="0" cellspacing="0" cellpadding="0" width="100%">
<tr>
<!-- 처음으로 버튼 -->
<td><a href="<?=$g4['path']?>/"><img src="<?=$g4['path']?>/images/home_mn.gif" border="0"></a></td>
<td width="15"><img src="<?=$g4['path']?>/images/side_mn.gif" border="0"></td>
<td><a href="<?=$g4['path']?>/"><img src="<?=$g4['path']?>/images/notice_mn.gif" border="0"></a></td>
<td width="15"><img src="<?=$g4['path']?>/images/side_mn.gif" border="0"></td>

<? if (!$member['mb_id']) { ?>
<!-- 로그인 이전 -->
<td><a href="<?=$g4['bbs_path']?>/login.php?url=<?=$urlencode?>"><img src="<?=$g4['path']?>/images/login_mn.gif" border="0"></a></td>
<td width="15"><img src="<?=$g4['path']?>/images/side_mn.gif" border="0"></td>
<td><a href="<?=$g4['bbs_path']?>/register.php"><img src="<?=$g4['path']?>/images/join_mn.gif" border="0"></a></td>
<td width="15"><img src="<?=$g4['path']?>/images/side_mn.gif" border="0"></td>
<? } else { ?>
<!-- 로그인 이후 -->
<td><a href="<?=$g4['bbs_path']?>/logout.php"><img src="<?=$g4['path']?>/images/logout_mn.gif" border="0"></a></td>
<td width="15"><img src="<?=$g4['path']?>/images/side_mn.gif" border="0"></td>
<td><a href="<?=$g4['bbs_path']?>/member_confirm.php?url=register_form.php"><img src="<?=$g4['path']?>/images/modify_mn.gif" border="0"></a></td>
<td width="15"><img src="<?=$g4['path']?>/images/side_mn.gif" border="0"></td>
<? } ?>

<!-- 최근게시물 버튼 -->
<td><a href="<?=$g4['bbs_path']?>/new.php"><img src="<?=$g4['path']?>/images/comm_mn.gif" border="0"></a></td>
<td width="15"><img src="<?=$g4['path']?>/images/side_mn.gif" border="0"></td>
<td><a href="<?=$g4['bbs_path']?>/new.php"><img src="<?=$g4['path']?>/images/rank_mn.gif" border="0"></a></td>

</tr>
</table>
</td>
</tr>
</table>
<table border="0" cellspacing="0" cellpadding="0" width="<?=$table_width?>">
<tr>
<!-- 상단메뉴 시작 -->
<td colspan="2">
<div style="background: url('<?=$g4['path']?>/images/top_bg.gif') repeat-x;">
<img src="<?=$g4['path']?>/images/top_left.gif" width="11" border="0">
<a href="<?=$g4['bbs_path']?>/"><img src="<?=$g4['path']?>/images/top_1.gif" border="0"></a>
<img src="<?=$g4['path']?>/images/top_side.gif" width="27" border="0">
<a href="<?=$g4['bbs_path']?>/"><img src="<?=$g4['path']?>/images/top_2.gif" border="0"></a>
<img src="<?=$g4['path']?>/images/top_side.gif" width="27" border="0">
<a href="<?=$g4['bbs_path']?>/"><img src="<?=$g4['path']?>/images/top_3.gif" border="0"></a>
<img src="<?=$g4['path']?>/images/top_side.gif" width="27" border="0">
<a href="<?=$g4['bbs_path']?>/"><img src="<?=$g4['path']?>/images/top_4.gif" border="0"></a>
<img src="<?=$g4['path']?>/images/top_side.gif" width="27" border="0">
<a href="<?=$g4['bbs_path']?>/"><img src="<?=$g4['path']?>/images/top_5.gif" border="0"></a>
<img src="<?=$g4['path']?>/images/top_side.gif" width="27" border="0">
<a href="<?=$g4['bbs_path']?>/"><img src="<?=$g4['path']?>/images/top_6.gif" border="0"></a>
<img src="<?=$g4['path']?>/images/top_side.gif" width="27" border="0">
<a href="<?=$g4['bbs_path']?>/"><img src="<?=$g4['path']?>/images/top_7.gif" border="0"></a>
<img src="<?=$g4['path']?>/images/top_side.gif" width="27" border="0">
<a href="<?=$g4['bbs_path']?>/"><img src="<?=$g4['path']?>/images/top_8.gif" border="0"></a>
<img src="<?=$g4['path']?>/images/top_side.gif" width="27" border="0">
<a href="<?=$g4['bbs_path']?>/"><img src="<?=$g4['path']?>/images/top_9.gif" border="0"></a>
<img src="<?=$g4['path']?>/images/top_right.gif" width="17" border="0">
</div>
</td>
<!-- 상단메뉴 끝 -->
</tr>
<tr><td height="10"></td></tr>
</table>
<!-- 상단 배경 끝 -->
--------------------------------------------------------------------------------------------------------------
여기까지..에요.