私がやろうとしているのは、ダイアログ ボックスが表示され、ユーザーがユーザー名を入力することです。[OK] をクリックすると、javascript 関数 mySearch 内の php コードが mysql で詳細を取得し、テキスト ボックスに表示します。ヘルプ。T_T うまくいきません。
    <script>
        function mySearch()
        {    var name = prompt("Search","Enter username");
            if (name!=null && name!="")
            {
                    var sentval = document.getElementById("sentval");
                    sentval.value = name;
                    <?php
                        $myLink = mysql_connect('localhost','root', '1234') or die(mysql_error());
                        $selectDB = mysql_select_db('proj2db', $myLink) or die(mysql_error());
                        $sql = "SELECT * FROM userTBL WHERE uName ='".$_POST['sentval']."'";
                        $exec = mysql_query($sql, $myLink);
                        $row = mysql_fetch_array($exec);
                        $uname = $row['uName'];
                        $pwd = $row['pwd'];
                        $code = $row['sAns'];
                        $link = $row['path'];
                    ?>              
            }
        }
    </script>
</head>
<body>
    <form method="post" action="" name="myform" id="myform">
        <input type="hidden" id="sentval"/>
        <center>
            <table>
                <tr>    
                    <td><font face="Tahoma" size = "2" color="#0B3861">Username:  </font></td>
                    <td>
                        <input type = "text" id = "uname" name = "uname" size="35" value="<?php echo $uname ?>"/>
                        <button type="button" style="height: 25px; width: 60px" onclick="mySearch()">Search</button>
                    </td>
                </tr>
                <tr>    
                    <td><font face="Tahoma" size = "2" color="#0B3861">Password:  </font></td>
                    <td><input type = "password" id = "pwd" name = "pwd" size="35" value="<?php echo $pwd ?>"/></td>
                </tr>
                <tr>
                    <td><font face="Tahoma" size = "2" color="#0B3861">Re-type Password:  </font></td>
                    <td><input type = "password" id = "repwd" name = "repwd" size="35" value="<?php echo $pwd ?>"/></td>
                </tr>
                <tr>
                    <td><font face="Tahoma" size = "2" color="#0B3861">Code:  </font></td>
                    <td><input type = "text" id = "code" name = "code" size="35" value="<?php echo $code ?>"/></td>
                </tr>
                <tr>
                    <td><font face="Tahoma" size = "2" color="#0B3861">Link:  </font></td>
                    <td><input type = "text" id = "link" name = "link" size="35" value="<?php echo $link ?>"/></td>
                </tr>
                <tr>                        
                    <td colspan=2 align="right">
                        <font face="Tahoma" size = "2" color="#0B3861">(e.g. http://www.google.com or index.php)</font>
                    </td>
                </tr>
                <tr>                        
                    <td colspan=2 align="right">
                        <input type="submit" name="submit" value="Save" style="height: 25px; width: 60px"/>
                        <button type="button" style="height: 25px; width: 60px" onclick="location.href='adminMain.php'">Cancel</button>
                    </td>
                </tr>               
            </table>
        </center>
    </form>
</body>
<?php
    if (!empty($_POST['uname']) && !empty($_POST['pwd']) && !empty($_POST['repwd']) && !empty($_POST['code']) && !empty($_POST['link']))
    {
        if ($_POST['pwd'] == $_POST['repwd'])
        {
            $myLink = mysql_connect('localhost','root', '1234') or die(mysql_error());
            $selectDB = mysql_select_db('proj2db', $myLink) or die(mysql_error());
            $sql = "UPDATE `proj2db`.`usertbl` SET pwd='".$_POST['pwd']."', sAns='".$_POST['code']."', path='".$_POST['link']."' WHERE uName='".$_POST['uname']."';";
            $exec = mysql_query($sql, $myLink);
        }
        else
            echo "<font face='Tahoma' size = '2' color='red'><center>Error: Password mismatched <br> Press cancel to return to home page </center></font>";
    }
?>