[JavaScript] 게시판 상세내용 열고 닫기

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<col width="55%">
<col width="20%">
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<tr>
    <th>번호</th>
    <th>제목</th>
    <th>작성자</th>
    <th>등록일</th>
    <th>조회수</th>
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<tbody>

<tr>
    <th>6</th>
    <td><a href="JavaScript:;" onclick="JavaScript: open_detail('1');">제목1</a></td>
    <th>작성자1</th>
    <th>2014.05.15</th>
    <th>526</th>
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    <td colspan="4">상세내용1</td>
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<tr>
    <th>5</th>
    <td><a href="JavaScript:;" onclick="JavaScript: open_detail('2');">제목2</a></td>
    <th>작성자2</th>
    <th>2014.05.15</th>
    <th>526</th>
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    <th></th>
    <td colspan="4">상세내용2</td>
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<tr>
    <th>4</th>
    <td><a href="JavaScript:;" onclick="JavaScript: open_detail('3');">제목3</a></td>
    <th>작성자3</th>
    <th>2014.05.15</th>
    <th>526</th>
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<tr>
    <th>3</th>
    <td><a href="JavaScript:;" onclick="JavaScript: open_detail('4');">제목4</a></td>
    <th>작성자4</th>
    <th>2014.05.15</th>
    <th>526</th>
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    <td colspan="4">상세내용4</td>
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<tr>
    <th>2</th>
    <td><a href="JavaScript:;" onclick="JavaScript: open_detail('5');">제목5</a></td>
    <th>작성자5</th>
    <th>2014.05.15</th>
    <th>526</th>
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