head.php http://sir.co.kr/manual/youngcart4/?man=page.htm 설명처럼
인덱스 파일의 왼쪽에도 걸치게끔 테이블 레이아웃을 하셨는지요?

소스를 살펴보니 테이블 테그를 잘못 작성 하셨습니다.

게사판 상단 파일로 연결한 파일을 열어서

<table width="913" height="409" cellpadding="0" cellspacing="0">

위에처럼 테이블이 시작되는 부분에

<table width="913" height="409" cellpadding="0" cellspacing="0" border="1">

 border="1"을 넣어서 확인 해보시면 어떤 부분이 잘못 되었는지 눈에 확 들어오실 겁니다..

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테이블 테그는 잘 모르지만 아래 방법을 참고 하세요...
(링그하신 페이지의 소스를 복사해서 대충 해보았습니다. 참고 하시어 수정하세요)

아래 소스를 게사판 상단 파일로 연결합니다.

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<table width="913" height="409" cellpadding="0" cellspacing="0">
    <tr>
        <td width="288" height="57" rowspan="2" colspan="4">
            <p align="center"><a href="../index.php"><img src="images/logo.png" border="0" alt="로고" width="251" height="66"></a></p>





        </td>
        <td valign="bottom" width="625" height="18">
            <p align="center">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<img
src="images/btn_home.gif" width="28" height="14" border="0"><img src="images/btn_div.gif" width="20" height="14" border="0"><img src="images/btn_join.gif" width="21" height="14" border="0"><img src="images/btn_div.gif" width="20" height="14" border="0"><img src="images/btn_login.gif" width="29" height="14" border="0"><img src="images/btn_div.gif" width="20" height="14" border="0"><img src="images/btn_sitemap.gif" width="43" height="14" border="0"></p>
        </td>

    </tr>

    <tr>
        <td width="625" height="33" valign="bottom">
            <p><a href="#" OnMouseOut="na_restore_img_src('image1', 'document')" OnMouseOver="na_change_img_src('image1', 'document', 'images/menu_1v.png', true);"><img src="images/menu2_1.png" width="92" height="39" border="0" name="image1"></a><a href="#" OnMouseOut="na_restore_img_src('image2', 'document')" OnMouseOver="na_change_img_src('image2', 'document', 'images/menu_2v.png', true);"><img src="images/menu2_2.png" width="130" height="39" border="0" name="image2"></a><a href="#"
OnMouseOut="na_restore_img_src('image3', 'document')" OnMouseOver="na_change_img_src('image3', 'document', 'images/menu_3v.png', true);"><img src="images/menu2_3.png" width="105" height="39" border="0" name="image3"></a><a href="#" OnMouseOut="na_restore_img_src('image4', 'document')" OnMouseOver="na_change_img_src('image4', 'document', 'images/menu_4v.png', true);"><img src="images/menu2_4.png" width="75" height="39" border="0" name="image4"></a><a href="#" OnMouseOut="na_restore_img_src('image5', 'document')"
OnMouseOver="na_change_img_src('image5', 'document', 'images/menu_5v.png', false);"><img src="images/menu2_5.png" width="107" height="39" border="0" name="image5"></a><a href="#" OnMouseOut="na_restore_img_src('image6', 'document')" OnMouseOver="na_change_img_src('image6', 'document', 'images/menu_6v.png', true);"><img src="images/menu_6.png" width="91" height="39" border="0" name="image6"></a></p>
        </td>
    </tr>
    <tr>
        <td width="913" colspan="5" height="15"><img src="images/bg_top_gap.jpg" width="898" height="9" border="0"></td>

    </tr>
    <tr>
        <td width="913" height="128" colspan="5">
            <p align="center"><img src="images/image_sub3.jpg" width="884" height="105" border="0"></p>
        </td>
    </tr>
    <tr>
        <td width="10" height="23">&nbsp;</td>
        <td width="166" height="23"><img src="images/left_title_sub1.jpg" width="166" height="82" border="0"></td>

        <td width="747" colspan="3" rowspan="7">
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그리고 아래 내용을 게사판 하단 파일로 연결합니다.

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</td>
    </tr>
    <tr>
        <td width="10" height="21">&nbsp;</td>
        <td width="166" height="21" OnMouseOut="namosw_cell_rollout(this)" OnMouseOver="namosw_cell_rollover(this, 'nmsw_a1')">&nbsp;&nbsp;&nbsp;<img src="images/bullet_submenu.jpg" width="3" height="5" border="0"> <a href="http://" target="_self"> 회사소개</a></td>

       
    </tr>
    <tr>
        <td width="10" height="19">&nbsp;</td>
        <td width="166" height="19" OnMouseOut="namosw_cell_rollout(this)" OnMouseOver="namosw_cell_rollover(this, 'nmsw_a1')">&nbsp;&nbsp;&nbsp;<img src="images/bullet_submenu.jpg" width="3" height="5" border="0"> <a href="http://" target="_self"> CEO 인사말</a></td>

       
    </tr>
    <tr>
        <td width="10" height="20">&nbsp;</td>
        <td width="166" height="20">&nbsp;&nbsp;&nbsp;<img src="images/bullet_submenu.jpg" width="3" height="5" border="0">  조직도</td>
       
    </tr>
    <tr>
        <td width="10" height="19">&nbsp;</td>
        <td width="166" height="19">&nbsp;&nbsp;&nbsp;<img src="bbs/images/bullet_submenu.jpg" width="3" height="5" border="0">  연혁</td>
       
    </tr>
    <tr>
        <td width="10" height="18">&nbsp;</td>
        <td width="166" height="18">&nbsp;&nbsp;&nbsp;<img src="images/bullet_submenu.jpg" width="3" height="5" border="0">  자문기관</td>
       

    </tr>
    <tr>
        <td width="10" height="21">&nbsp;</td>
        <td width="166" height="21">&nbsp;&nbsp;&nbsp;<img src="images/bullet_submenu.jpg" width="3" height="5" border="0">  오시는 길</td>

    </tr>
<tr>
        <td width="10"></td>
        <td width="166"></td>
        <td width="43"></td>
        <td width="69"></td>
        <td width="625"></td>
    </tr>
</table>

</body>

</html>