ProtType

<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <link type="text/css" rel="stylesheet" href="style1.css">
    <title>prototype</title>

    <script type="text/javascript" language="javascript">
      function onButtonClick() {

         var target = document.getElementById("output");
         target.innerText = document.forms.id_form1.id_textBox1.value;
       }

 </script>

  </head>
  <body>
  <div class="wrapper">
    <div class="header">
      <h1>つぅちったー</h1>
    </div>
    <div class="profile">
        <img src="#" alt="hoge">
        <h2 class="profile_name">hoge</h2>
        <label class="profile_id">@hogehoge</label>
      <ul>
        <li class="profile_list">ポスト</li>
        <li class="profile_list">支持者</li>
        <li class="profile_list">被支持者</li>
      </ul>
    </div>
    <div class="Posting_Box">
    <p class="Posting_Box_P ">思ったことを投稿する</p>
    <form name="form1" id="id_form1" action="">
      <input name="textBox1" id="id_textBox1" type="text" value="" maxlength="140"/>
      <button type="button" value="Exec" onclick="onButtonClick();" />
      <button type="button" value="images"/>
    </form>
    </div>

    <div id ="output">



    </div>
  </div>


  </body>
</html>