<form target="iframe_b" action="/php_src/first.php" method="POST"
        echo "sending data">

fieldset>
 <legend style="font-size:150%"><b>send MTData</b></legend>
 <br><br>
    <input type="button" id="select_all" name="select_all" value="Select All">
    <input type="button" id="de_select_all" name="de_select_all" value="DeSelect All">
    <br><br>
    <input type="submit" value="Submit">

  <?php
$dbhost = 'localhost:3036';
    $dbuser = 'root';
    $dbpass = 'XXXX';
    $conn   = mysql_connect($dbhost, $dbuser, $dbpass);
    if (!$conn) {
        die('Could not connect: ' . mysql_error());
    }
    mysql_select_db("ApplicationServer") or die(mysql_error());
    // Get all the data from the "example" table
    $result = mysql_query("SELECT EXTERNAL_ID,CONNECTION_STATUS FROM DEVICE_DETAILS") or die(mysql_error());
     echo "<table border='1'>";
    echo "<tr><th>Selection</th> <th>External ID</th> <th>Device status</th> <th>MT data<th> </tr>";
    while ($row = mysql_fetch_array($result)) {
        // Print out the contents of each row into a table
        $temp =  $row['EXTERNAL_ID'];
        echo "<tr><td>";
        echo "<input type="checkbox" id="id_extID"  name="yourCheckboxName".$temp."" />";
        echo "<td>";
        echo $row['EXTERNAL_ID'];
        echo "</td><td>";
        echo $row['CONNECTION_STATUS'];
        echo "</td><td>";
         echo "<input type="textbox" name="textboxName".$temp."" size="50" value = "$temp._data" />";
        echo "</td></tr>";
    }
    echo "</table>";
     mysql_close($conn);

<script type="text/javascript">

$('#select_all').click(function() {
        $('#id_extID option').prop('selected', true);
    });


$('#de_select_all').click(function() {
        $('#id_extID option').prop('selected', false);
    });
</script>