如何活动td中的数据

<html>
    <head>
         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <meta http-equiv="pragma" content="no-cache"/>
        <meta http-equiv="Cache-Control" content="no-cache, no-store"/>
     <title>111</title>
     <style type="text/css">
        
     </style>
    </head>
    <body>
        <div><form action="listupdate.php" method="post"name="listform">
            
            <table border="1" cellspacing="0" width="500px"id="userinformation">
            <tr>
                <td>用戶名</td>
                <td>密碼</td> 
                <td>等級</td> 
                <td>編輯</td>
                <td>操作</td>
            </tr>
            <br>
            <?php 
        $dbhost='localhost';
        $dbuser='test2';
        $dbpass='test2';
        $dbname='test2';
        $conn=NULL;
//連接數據庫
function conncctDB($dbhost,$dbuser,$dbpass,$dbname,$conn)
{
    $conn=mysql_connect($dbhost,$dbuser,$dbpass) 
            or die ('Error with MySQL connection');
    mysql_select_db($dbname,$conn);
    mysql_query("SET NAMES 'UTF8'");
    mysql_query("SET CHARACTER SET UTF8");
    mysql_query("SET CHARACTER_SET_RESULTS=UTF8");
}
conncctDB($dbhost, $dbuser, $dbpass, $dbname, $conn);
            $str="select * from password ";
            $query=mysql_query($str);
           // echo $str."<br>";
           // echo $query."<br>";
            while($result=mysql_fetch_array($query))
            {   $resultid=$result["ID"];
                $resultpw=$result["PW"];
                $resultlv=$result["LV"];
                $resultedit=$result["EDIT"];
                ?>
            
            <tr>
            
                <td  ><input type='text' value="<?=$resultid?>" name="<?=$resultid?>" readonly='readonly'id=<?=$resultid?>> <?=$result["ID"]?> </td>
                <td ><?=$result["PW"]?></td>
                <td ><?=$result["LV"]?></td>
                <td ><?=$result["EDIT"]?></td>
                <td><input type='submit' name='submit' value='修改'action="listupdate.php?user_id=$resultid" '></td>
            </tr>
            
                
            
               
            <?php
            
            }       
            ?>
            
          </table>
                </form>
        </div>
        <div>
            <form name="form1"method="post" action="listadd.php">
           <p>用戶名:<input name="username" type="text" size="20" id="username"></p>
           <p>密&nbsp;碼：<input type="password" name="userpassword" size="20"id="userpassword"></p>
           <p>LV:<select name="lv" id="lv" >
                   <option>1</option>
                   <option>2</option>
                   <option>3</option>
               </select></p>
               <p><input type="submit" name="submit" value="添加"></p>
            </form>
        </div>
    </body>
    </html> 
已经查询获得数据库中额数据在table中 如何点击修改按钮直接跳转页面 并直接获得所在的td中的数值啊