Ajax js code for online submission of messages and real-time display [revised version]_form special effects

Friends who are learning Ajax submission may wish to refer to it, and you will understand some techniques from it.
Due to a problem with the code itself, Script Home has corrected it. Everyone is welcome to test it.

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>Ajax Guestbook</title> <style type="text/css"> * { padding: 0; margin: 0; } li { list-style: none; } body { background: #f9f9f9; font-size: 14px; } #explain { height: 60px; border-bottom: 1px solid #999999; background: #eee; font-size: 14px; color: #666; text-align: center; line-height: 60px; } #explain a { color: #990000; font-weight: bold; text-decoration: none; border-bottom: 1px dotted #990000; } #explain a:hover { border-bottom: 2px solid #990000; } #explain strong { color: #990000; } #box { width: 450px; padding: 10px; border: 1px solid #ccc; background: #f4f4f4; margin: 10px auto; } #fill_in { margin-bottom: 10px; } #fill_in li { padding: 5px 0; } #fill_in .text { width: 380px; height: 30px; padding: 0 10px; border: 1px solid #ccc; line-height: 30px; font-size: 14px; font-family: arial; } #fill_in textarea { width: 380px; height: 100px; line-height: 20px; padding: 5px 10px; border: 1px solid #ccc; font-size: 14px; font-family: arial; overflow: auto; vertical-align: top; } #fill_in .btn { border: none; width: 100px; height: 30px; border: 1px solid #ccc; background: #fff; color: #666; font-size: 14px; position: relative; left: 42px; } #message_text { display: none; } #message_text h2 { font-size: 14px; padding: 6px 0 4px 10px; background: #ddd; border-bottom: 1px solid #ccc; } #message_text li { background: #f9f9f9; border-bottom: 1px solid #ccc; color: #666; overflow: hidden; } #message_text h3 { padding: 10px; font-size: 14px; line-height: 24px; } #message_text p { padding: 0 10px 10px; text-indent: 28px; line-height: 20px; } </style> <div id="explain"> </div> You may wish to submit a few more messages to try...<div id="box"> <ul id="fill_in"> </ul> <form> <li> <input id="text" type="text" class="text">Name: </li> <li> <textarea id="content" style="width:300px; height:100px">Content: