우선 그누보드 최신버전에서
/skin/board/basic/ajax.filter.php 파일을 사용스킨 폴더에 업로드합니다. --- 필수
write.skin.php 파일 수정해서 아래 첨부합니다.

2개 같이 올려야합니다.


write.skin.php

<?
if (!defined("_GNUBOARD_")) exit; // 개별 페이지 접근 불가

if ($is_dhtml_editor) {
    include_once("$g4[path]/lib/cheditor4.lib.php");
    echo "<script src='$g4[cheditor4_path]/cheditor.js'></script>";
    echo cheditor1('wr_content', '100%', '250');
}
$mask="mask_l";
?>
<style type="text/css">
<!--
.write_head { height:30px; text-align:center; color:#8492A0; }
.field { border:1px solid #ccc; }
.asdf {
position: relative;
}
-->
</style>

<SCRIPT language=javascript>
<!--
clicked = false;
var st_sc = 0;
var pleft = "";
var ptop = "";
var dragxcoor = "";
var dragycoor = "";
var newx = 0;
var newy = 0;
function startDrag(cx,cy) {
// 움직임 제어 처음클릭에 움직이고 두번째 클릭에 멈춤
if(clicked == false){
clicked = true;
document.getElementById("tb_bu").style.cursor = "move";
document.getElementById("tb_bu").alt = "한번더 클릭하면 위치가 고정되요.";
}else{
clicked = false;
document.getElementById("tb_bu").style.cursor = "hand";
document.getElementById("tb_bu").alt = "클릭하면 마우스를 따라 다녀요.";
if(document.getElementById("tbnum").value){
f_num = document.getElementById("tbnum").value;
document.getElementById("loc_x["+f_num+"]").value = document.getElementById("mask").style.left.replace("px", "");
document.getElementById("loc_y["+f_num+"]").value = document.getElementById("mask").style.top.replace("px", "");
}
}
  //레이어 초기값
  pleft=parseInt(document.getElementById("mask").style.left);
  ptop=parseInt(document.getElementById("mask").style.top);
  //마우스 초기값
  dragxcoor=cx;
  dragycoor=cy;
  //스크롤바 초기값저장
  st_sc = parseInt(document.body.scrollTop);
}

function dragBox(evt) {
  //약어지정
  e = evt || event;
  //섬네일 이미지 크기확인
  t_X = document.getElementById("thumbnail").style.width;
  t_X = t_X.replace("px", "");
  t_Y = document.getElementById("thumbnail").style.height;
  t_Y = t_Y.replace("px", "");
  //마스크 크기확인
  m_X = document.getElementById("mask").style.width;
  m_X = m_X.replace("px", "");
  m_Y = document.getElementById("mask").style.height;
  m_Y = m_Y.replace("px", "");
  // 마스크 이동 최대 영역
  max_X = t_X - m_X;
  max_Y = t_Y - m_Y;
  // 마스크이동영역을 제어 하기 위해 한번더 저장
  move_x = max_X;
  move_y = max_Y;
 
  //스크롤바 가 생길경우를 대비
  no_sc = parseInt(document.body.scrollTop);
  //현재 스크롤바 위치에서 초기 스크롤바 값을 빼서 레이어 위치값을 보정함.
  tb_sc = no_sc - st_sc;
 
  if (clicked == true) {
  //레이어 x, y 위치값
    newx = pleft+e.clientX-dragxcoor;
    newy = ptop+e.clientY-dragycoor+tb_sc;
//레이어가 영역안에서만 움직일수 있도록 제어
if(move_x > 0) document.getElementById("mask").style.left=newx;
    if(move_y > 0) document.getElementById("mask").style.top=newy;
    //        return false;
  }

if(max_X > 0){
if(parseInt(document.getElementById("mask").style.left) < 0) {
  move_x = 0;
document.getElementById("mask").style.left = 0;
}
  if(parseInt(document.getElementById("mask").style.left) > max_X) {
  move_x = 0;
document.getElementById("mask").style.left = max_X;
  }
}
if(max_Y > 0){
  if(parseInt(document.getElementById("mask").style.top) < 0) {
  move_y = 0;
document.getElementById("mask").style.top = 0;
  }
if(parseInt(document.getElementById("mask").style.top) > max_Y) {
  move_y = 0;
document.getElementById("mask").style.top = max_Y;
}
  }
}

document.onmousemove = dragBox;

//-->
</SCRIPT>

<div style="height:14px; line-height:1px; font-size:1px;">&nbsp;</div>


<script language="javascript">
// 글자수 제한
var char_min = parseInt(<?=$write_min?>); // 최소
var char_max = parseInt(<?=$write_max?>); // 최대
</script>

<form name="fwrite" method="post" onsubmit="return fwrite_submit(this);" enctype="multipart/form-data" style="margin:0px;">
<input type=hidden name=null>
<input type=hidden name=w        value="<?=$w?>">
<input type=hidden name=bo_table value="<?=$bo_table?>">
<input type=hidden name=wr_id    value="<?=$wr_id?>">
<input type=hidden name=sca      value="<?=$sca?>">
<input type=hidden name=sfl      value="<?=$sfl?>">
<input type=hidden name=stx      value="<?=$stx?>">
<input type=hidden name=spt      value="<?=$spt?>">
<input type=hidden name=sst      value="<?=$sst?>">
<input type=hidden name=sod      value="<?=$sod?>">
<input type=hidden name=page    value="<?=$page?>">
<input type=hidden name=tbnum >
<input type=hidden name=tbx value="<?=$board[bo_1]?>">
<input type=hidden name=tby value="<?=$board[bo_2]?>">
<input type=hidden name=tbpath value="<?=$board_skin_path?>">

<table width="<?=$width?>" align=center cellpadding=0 cellspacing=0><tr><td>


<div style="border:1px solid #ddd; height:34px; background:url(<?=$board_skin_path?>/img/title_bg.gif) repeat-x;">
<div style="font-weight:bold; font-size:14px; margin:7px 0 0 10px;">:: <?=$title_msg?> ::</div>
</div>
<div style="height:3px; background:url(<?=$board_skin_path?>/img/title_shadow.gif) repeat-x; line-height:1px; font-size:1px;"></div>


<table width="100%" border="0" cellspacing="0" cellpadding="0">
<colgroup width=90>
<colgroup width=''>
<tr><td colspan="2" style="background:url(<?=$board_skin_path?>/img/title_bg.gif) repeat-x; height:3px;"></td></tr>
<? if ($is_name) { ?>
<tr>
    <td class=write_head>이 름</td>
    <td><input class='field' maxlength=20 size=15 name=wr_name itemname="이름" required value="<?=$name?>"></td></tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>

<? if ($is_password) { ?>
<tr>
    <td class=write_head>패스워드</td>
    <td><input class='field' type=password maxlength=20 size=15 name=wr_password itemname="패스워드" <?=$password_required?>></td></tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>

<? if ($is_email) { ?>
<tr>
    <td class=write_head>이메일</td>
    <td><input class='field' maxlength=100 size=50 name=wr_email email itemname="이메일" value="<?=$email?>"></td></tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>

<? if ($is_homepage) { ?>
<tr>
    <td class=write_head>홈페이지</td>
    <td><input class='field' size=50 name=wr_homepage itemname="홈페이지" value="<?=$homepage?>"></td></tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>

<?
$option = "";
$option_hidden = "";
if ($is_notice || $is_html || $is_secret || $is_mail) {
    $option = "";
    if ($is_notice) {
        $option .= "<input type=checkbox name=notice value='1' $notice_checked>공지&nbsp;";
    }

    if ($is_html) {
        if ($is_dhtml_editor) {
            $option_hidden .= "<input type=hidden value='html1' name='html'>";
        } else {
            $option .= "<input onclick='html_auto_br(this);' type=checkbox value='$html_value' name='html' $html_checked><span class=w_title>html</span>&nbsp;";
        }
    }

    if ($is_secret) {
        if ($is_admin || $is_secret==1) {
            $option .= "<input type=checkbox value='secret' name='secret' $secret_checked><span class=w_title>비밀글</span>&nbsp;";
        } else {
            $option_hidden .= "<input type=hidden value='secret' name='secret'>";
        }
    }
   
    if ($is_mail) {
        $option .= "<input type=checkbox value='mail' name='mail' $recv_email_checked>답변메일받기&nbsp;";
    }
}

echo $option_hidden;
if ($option) {
?>
<tr>
    <td class=write_head>옵 션</td>
    <td><?=$option?></td></tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>

<? if ($is_category) { ?>
<tr>
    <td class=write_head>분 류</td>
    <td><select name=ca_name required itemname="분류"><option value="">선택하세요<?=$category_option?></select></td></tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>

<tr>
    <td class=write_head>제 목</td>
    <td><input class='field' style="width:100%;" name=wr_subject id="wr_subject" itemname="제목" required value="<?=$subject?>"></td></tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<tr>
    <td class=write_head style='padding-left:20px;'>내용</td>
    <td style='padding:5 0 5 0;'>
        <? if ($is_dhtml_editor) { ?>
            <?=cheditor2('wr_content', $content);?>
        <? } else { ?>
        <table width=100% cellpadding=0 cellspacing=0>
        <tr>
            <td width=50% align=left valign=bottom>
                <span style="cursor: pointer;" onclick="textarea_decrease('wr_content', 10);"><img src="<?=$board_skin_path?>/img/up.gif"></span>
                <span style="cursor: pointer;" onclick="textarea_original('wr_content', 10);"><img src="<?=$board_skin_path?>/img/start.gif"></span>
                <span style="cursor: pointer;" onclick="textarea_increase('wr_content', 10);"><img src="<?=$board_skin_path?>/img/down.gif"></span></td>
            <td width=50% align=right><? if ($write_min || $write_max) { ?><span id=char_count></span>글자<?}?></td>
        </tr>
        </table>
        <textarea id="wr_content" name="wr_content" class=tx style='width:100%; word-break:break-all;' rows=10 itemname="내용" required
        <? if ($write_min || $write_max) { ?>onkeyup="check_byte('wr_content', 'char_count');"<?}?>><?=$content?></textarea>
        <? if ($write_min || $write_max) { ?><script language="javascript"> check_byte('wr_content', 'char_count'); </script><?}?>
        <? } ?>    </td>
</tr>
<tr><td colspan=2 height=1 bgcolor=#dddddd></td></tr>

<? if ($is_link) { ?>
<? for ($i=1; $i<=$g4[link_count]; $i++) { ?>
<tr>
    <td class=write_head>링크 #<?=$i?></td>
    <td><input type='text' class='field' size=50 name='wr_link<?=$i?>' itemname='링크 #<?=$i?>' value='<?=$write["wr_link{$i}"]?>'></td>
</tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>
<? } ?>

<? if ($is_file) { ?>

<tr><td colspan=2 align="center" valign="middle" style="padding:5 5 5 5; "><table border="0" cellpadding="1" cellspacing="1" bgcolor="#CCCCCC">
      <tr>
        <td valign="top" bgcolor="#FFFFFF"><div id="thumbnail" style="height: 200; width: 200; background-image: url(<?=$board_skin_path?>/img/rinix.png); background-repeat: no-repeat; background-position: center center;"><div id="mask" style="border: 1px solid #FF0000; position:relative; width:<?=$board[bo_1]?>; height:<?=$board[bo_2]?>; left:0; top:0; display:table;"><img src="<?=$board_skin_path?>/img/bu.png" alt="클릭하면 마우스를 따라 다녀요." name="tb_bu" width="<?=$board[bo_1]?>" height="<?=$board[bo_2]?>" id="tb_bu" style="cursor:hand" onclick="startDrag(event.clientX, event.clientY)"/></div>
          </div></td>
      </tr>
    </table><iframe width="0" height="0" name="load_thumbnail" frameborder="0"></iframe></td>
</tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<tr>
    <td class=write_head>
        <table cellpadding=0 cellspacing=0>
        <tr>
            <td class=write_head style="padding-top:10px; line-height:20px;">
                파일첨부<br>
                <span onclick="add_file();" style="cursor:pointer;"><img src="<?=$board_skin_path?>/img/btn_file_add.gif"></span>
                <span onclick="del_file();" style="cursor:pointer;"><img src="<?=$board_skin_path?>/img/btn_file_minus.gif"></span>            </td>
        </tr>
        </table>    </td>
    <td style='padding:5 0 5 0;'>
      <table id="variableFiles" cellpadding=0 cellspacing=0>
      </table>
      <?// print_r2($file); ?>
        <script language="JavaScript">
        var flen = 0;
        function add_file(delete_code)
        {
            var upload_count = <?=(int)$board[bo_upload_count]?>;
            if (upload_count && flen >= upload_count)
            {
                alert("이 게시판은 "+upload_count+"개 까지만 파일 업로드가 가능합니다.");
                return;
            }

            var objTbl;
            var objRow;
            var objCell;
            if (document.getElementById)
                objTbl = document.getElementById("variableFiles");
            else
                objTbl = document.all["variableFiles"];

            objRow = objTbl.insertRow(objTbl.rows.length);
            objCell = objRow.insertCell(0);

            objCell.innerHTML = "<input type='file' class='field' name='bf_file["+flen+"]' onchange='re_set("+flen+")' title='파일 용량 <?=$upload_max_filesize?> 이하만 업로드 가능'> <div id='div_bu["+flen+"]' style='display:inline; position: relative;'><input onclick='add_thumbnail(" + flen + ");' type='button' name='but["+flen+"]' class='field' value='섬네일' style='width:53; height:19' /></div>";
objCell.innerHTML += "<input type='hidden' name='loc_x["+flen+"]'><input type='hidden' name='loc_y["+flen+"]'><input type='hidden' name='tb_name["+flen+"]'>";
objCell.innerHTML += "<input type='hidden'  name='ma_width["+flen+"]'><input type='hidden' name='ma_height["+flen+"]'>";
objCell.innerHTML += "<input type='hidden' name='tb_width["+flen+"]'><input type='hidden' name='tb_height["+flen+"]'>";
objCell.innerHTML += "<input type='hidden' name='dell_file["+flen+"]'>";
            if (delete_code)
                objCell.innerHTML += delete_code;
            else
            {
                <? if ($is_file_content) { ?>
                objCell.innerHTML += "<br><input type='text' class='field' size=50 name='bf_content[]' title='업로드 이미지 파일에 해당 되는 내용을 입력하세요.'>";
                <? } ?>
                ;
            }

            flen++;
        }

        <?=$file_script; //수정시에 필요한 스크립트?>
<?
if($file){
for($i=0; $i<$file[count]; $i++){
?>
document.getElementById("dell_file["+<?=$i?>+"]").value = "<?=$file[$i][file]?>";
<?
}
}
?>

        function del_file()
        {
            // file_length 이하로는 필드가 삭제되지 않아야 합니다.
            var file_length = <?=(int)$file_length?>;
            var objTbl = document.getElementById("variableFiles");
            if (objTbl.rows.length - 1 > file_length)
            {
                objTbl.deleteRow(objTbl.rows.length - 1);
                flen--;
            }
        }

        </script>
        </td>
    </tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>

<? if ($is_trackback) { ?>
<tr>
    <td class=write_head>트랙백주소</td>
    <td><input class='field' size=50 name=wr_trackback itemname="트랙백" value="<?=$trackback?>">
        <? if ($w=="u") { ?><input type=checkbox name="re_trackback" value="1">핑 보냄<? } ?></td>
</tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>

<? if ($is_guest) { ?>
<tr>
    <td class=write_head><img id='kcaptcha_image' /></td>
    <td><input class='ed' type=input size=10 name=wr_key itemname="자동등록방지" required>&nbsp;&nbsp;왼쪽의 글자를 입력하세요.</td>
</tr>
<tr><td colspan=2 height=1 bgcolor=#e7e7e7></td></tr>
<? } ?>
</table>

<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
    <td width="100%" align="center" valign="top" style="padding-top:30px;">
        <input type=image id="btn_submit" src="<?=$board_skin_path?>/img/btn_write.gif" border=0 accesskey='s'>&nbsp;
        <a href="./board.php?bo_table=<?=$bo_table?>"><img id="btn_list" src="<?=$board_skin_path?>/img/btn_list.gif" border=0></a></td>
</tr>
</table>

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

<script type="text/javascript" src="<?="$g4[path]/js/jquery.kcaptcha.js"?>"></script>
<script type="text/javascript">
<?
// 관리자라면 분류 선택에 '공지' 옵션을 추가함
if ($is_admin)
{
    echo "
    if (typeof(document.fwrite.ca_name) != 'undefined')
    {
        document.fwrite.ca_name.options.length += 1;
        document.fwrite.ca_name.options[document.fwrite.ca_name.options.length-1].value = '공지';
        document.fwrite.ca_name.options[document.fwrite.ca_name.options.length-1].text = '공지';
    }";
}
?>

with (document.fwrite)
{
    if (typeof(wr_name) != "undefined")
        wr_name.focus();
    else if (typeof(wr_subject) != "undefined")
        wr_subject.focus();
    else if (typeof(wr_content) != "undefined")
        wr_content.focus();

    if (typeof(ca_name) != "undefined")
        if (w.value == "u")
            ca_name.value = "<?=$write[ca_name]?>";
}

function html_auto_br(obj)
{
    if (obj.checked) {
        result = confirm("자동 줄바꿈을 하시겠습니까?\n\n자동 줄바꿈은 게시물 내용중 줄바뀐 곳을<br>태그로 변환하는 기능입니다.");
        if (result)
            obj.value = "html2";
        else
            obj.value = "html1";
    }
    else
        obj.value = "";
}

function fwrite_submit(f)
{
    if (document.getElementById('char_count')) {
        if (char_min > 0 || char_max > 0) {
            var cnt = parseInt(document.getElementById('char_count').innerHTML);
            if (char_min > 0 && char_min > cnt) {
                alert("내용은 "+char_min+"글자 이상 쓰셔야 합니다.");
                return false;
            }
            else if (char_max > 0 && char_max < cnt) {
                alert("내용은 "+char_max+"글자 이하로 쓰셔야 합니다.");
                return false;
            }
        }
    }

    <?
    if ($is_dhtml_editor) echo cheditor3('wr_content');
    ?>

    if (document.getElementById('tx_wr_content')) {
        if (!ed_wr_content.outputBodyText()) {
            alert('내용을 입력하십시오.');
            ed_wr_content.returnFalse();
            return false;
        }
    }

    var subject = "";
    var content = "";
    $.ajax({
        url: "<?=$board_skin_path?>/ajax.filter.php",
        type: "POST",
        data: {
            "subject": f.wr_subject.value,
            "content": f.wr_content.value
        },
        dataType: "json",
        async: false,
        cache: false,
        success: function(data, textStatus) {
            subject = data.subject;
            content = data.content;
        }
    });

    if (subject) {
        alert("제목에 금지단어('"+subject+"')가 포함되어있습니다");
        f.wr_subject.focus();
        return false;
    }

    if (content) {
        alert("내용에 금지단어('"+content+"')가 포함되어있습니다");
        if (typeof(ed_wr_content) != "undefined")
            ed_wr_content.returnFalse();
        else
            f.wr_content.focus();
        return false;
    }

    if (typeof(f.wr_key) != 'undefined') {
        if (hex_md5(f.wr_key.value) != md5_norobot_key) {
            alert('자동등록방지용 글자가 제대로 입력되지 않았습니다.');
            f.wr_key.select();
            f.wr_key.focus();
            return false;
        }
    }

    document.getElementById('btn_submit').disabled = true;
    document.getElementById('btn_list').disabled = true;

    <?
    if ($g4[https_url])
        echo "f.action = '$g4[https_url]/$g4[bbs]/write_update.php';";
    else
        echo "f.action = './write_update.php';";
    ?>
   
    return true;
}
</script>

<script language="JavaScript" src="<?="$g4[path]/js/board.js"?>"></script>
<script language="JavaScript"> window.onload=function() { drawFont(); } </script>

<script language="JavaScript">
function typcheck(inp)
{
 var lastidx = -1;
 lastidx = inp.lastIndexOf('.');
 var extension = inp.substring(lastidx+1, inp.length);

if((lastidx != -1) && (extension.toLowerCase() == "jpg")){
  return true;
}else if((lastidx != -1) && (extension.toLowerCase() == "png")){
return true;
}else if((lastidx != -1) && (extension.toLowerCase() == "gif")){
return true;
}else{
return false;
}
}

function add_thumbnail(nt)
{
var f = document.fwrite;
var file = f['bf_file['+nt+']'];
var img_t = file.value;
f.tbnum.value = nt;

if(!typcheck(img_t)){
document.getElementById("div_bu["+nt+"]").style.display = "none";
//alert("jpg, gif, png 파일만 섬네일 생성이 가능합니다.");
return true;
}else{
document.getElementById("div_bu["+nt+"]").style.display = "inline";
}

if(document.getElementById("tb_name["+nt+"]").value){
document.getElementById("thumbnail").style.width = document.getElementById("tb_width["+nt+"]").value;
document.getElementById("thumbnail").style.height = document.getElementById("tb_height["+nt+"]").value;
document.getElementById("thumbnail").style.background = "url('../data/rinix/"+document.getElementById("tb_name["+nt+"]").value+"')";
document.getElementById("mask").style.left = document.getElementById("loc_x["+nt+"]").value;
document.getElementById("mask").style.top = document.getElementById("loc_y["+nt+"]").value;
document.getElementById("mask").style.width = document.getElementById("ma_width["+nt+"]").value;
document.getElementById("mask").style.height = document.getElementById("ma_height["+nt+"]").value;
document.getElementById("tb_bu").style.width = document.getElementById("ma_width["+nt+"]").value;
document.getElementById("tb_bu").style.height = document.getElementById("ma_height["+nt+"]").value;
}else{
if(img_t){
f.target = "load_thumbnail";
f.action = "<?=$board_skin_path?>/thumbnail_upload.php";
f.submit();
}else{
alert("먼저 이미지를 선택해주세요");
}
}
}
function re_set(nt){

dell_ck = document.getElementById("bf_file_del["+nt+"]");
if(dell_ck) dell_ck.checked = true;

document.getElementById("tb_name["+nt+"]").value = "";
document.getElementById("tb_width["+nt+"]").value = "";
document.getElementById("tb_height["+nt+"]").value = "";
document.getElementById("loc_x["+nt+"]").value = "";
document.getElementById("loc_y["+nt+"]").value = "";
document.getElementById("ma_width["+nt+"]").value = "";
document.getElementById("ma_height["+nt+"]").value = "";
add_thumbnail(nt);

}
</script>

쓰기로 넘어가면 오류가 뜹니다.(수정 이전에도 떴었는데..)
그 오류를 찾아보세요.. 1군데..

살펴봤는데
현재 스킨상의 오류는 아닌듯합니다.

그누보드 최신버젼에 옛 스킨을 사용하신다면 위와 같은 오류가 발생하던데요... ㅠㅠ

쓰기에서 문제가 생기면 제 생각에 스킨상에서 오류가 생기는건 분명합니다.

최신버젼의 글쓰기 스킨과 사용하시려는 스킨를 잘 비교해보세요.