<div id="content_area">

        <?php echo $lalala; ?>
    </div>

.
.
.

<?php
include 'template.php';
$lalala = '  <tr>

            <td>Kraj</td>
            <td><select id="id_kraja" onchange="zmen_kraj()">
                    <option">Vyber kraj</option>


                  <?php
                    $res = mysqli_query($db, "select * from region");
                    while ($row = mysqli_fetch_array($res)) {
                        ?>

                       <option value="<?php echo $row["id"]; ?>"><?php echo $row["name"]; ?></option>

                        <?php
                    }
                    ?>

                </select>
            </td>
        </tr>';

?>