게시글 카테고리 오류

<?php if ($is_category) { ?>
        <tr>
        <th rowspan=2>분류</th>
        <td colspan=2>
        <?
        $arr=explode("|",$board[bo_category_list]);

        foreach($arr as $str) { ?>
        <input type=checkbox id=ca_name name=ca_name value='<?=$str?>' checked='<?php echo $sca == $str ? "true" : "false"  ?>'><?=$str?>
        <? } ?>

        <script>
        var f = document.fwrite;
        var str=",<?=$write[ca_name]?>,";
        for (var i=0; i<f.length; i++) {
            if (f.elements[i].name == "chk_ca_name[]") {
                if (str.indexOf(','+f.elements[i].value+',')>=0) {
                    f.elements[i].checked = true;
                }
            }
        }
        </script>
            </td>
        </tr>
        <tr><td colspan=2 height=1 style="color:red; font-size:11px;">＊한가지만 선택하세요</td></tr>
        <?php } ?>