很弱的js表格换行效果（表格移动行）

<！DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> </head> <body><br/><br/><br/> <table width="300" style="font-size:12px" border="3" align="center" cellpadding="5" cellspacing="3" bordercolor="#FFFFFF" bgcolor="#99CC66" id="table1"> <tr> <td width="25%" align="center" bgcolor="#FFFFCC">1</td> <td width="25%" align="center" bgcolor="#FFFFCC">11</td> <td width="25%" align="center" bgcolor="#FFFFCC">上移</td> <td width="25%" align="center" bgcolor="#FFFFCC">下移</td> </tr> <tr> <td align="center" bgcolor="#FFFFCC">2</td> <td align="center" bgcolor="#FFFFCC">22</td> <td align="center" bgcolor="#FFFFCC">上移</td> <td align="center" bgcolor="#FFFFCC">下移</td> </tr> <tr> <td align="center" bgcolor="#FFFFCC">3</td> <td align="center" bgcolor="#FFFFCC">33</td> <td align="center" bgcolor="#FFFFCC">上移</td> <td align="center" bgcolor="#FFFFCC">下移</td> </tr> <tr> <td align="center" bgcolor="#FFFFCC">4</td> <td align="center" bgcolor="#FFFFCC">44</td> <td align="center" bgcolor="#FFFFCC">上移</td> <td align="center" bgcolor="#FFFFCC">下移</td> </tr> <tr> <td align="center" bgcolor="#FFFFCC">5</td> <td align="center" bgcolor="#FFFFCC">55</td> <td align="center" bgcolor="#FFFFCC">上移</td> <td align="center" bgcolor="#FFFFCC">下移</td> </tr> </table> <script language="javascript" type="text/javascript"></script> </body> </html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]