Formulário com Modal

Olá pessoal, eu tenho um form:

 <form id="resp_form" method="POST" action="functions/update.php" enctype="multipart/form-data">
 <?php
 if ($res=$mysqli->query($queryResult)) {
 if($res) {
 while($row = mysqli_fetch_array($res)):
 ?>
 <div class="panel panel-default">
 <div class="panel-heading">
 <h3 class="panel-title">Área</h3>
 </div>
 <div class="panel-body">

 <div class="form-group">
 <div>
 <table>
 <tr><td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="0" id="<?php echo $row['cod_area']."0"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."0"; ?>" class="css-label radGroup2">0</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="1" id="<?php echo $row['cod_area']."1"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."1"; ?>" class="css-label radGroup2">1</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="2" id="<?php echo $row['cod_area']."2"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."2"; ?>" class="css-label radGroup2">2</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="3" id="<?php echo $row['cod_area']."3"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."3"; ?>" class="css-label radGroup2">3</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="4" id="<?php echo $row['cod_area']."4"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."4"; ?>" class="css-label radGroup2">4</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="5" id="<?php echo $row['cod_area']."5"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."5"; ?>" class="css-label radGroup2">5</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="6" id="<?php echo $row['cod_area']."6"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."6"; ?>" class="css-label radGroup2">6</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="7" id="<?php echo $row['cod_area']."7"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."7"; ?>" class="css-label radGroup2">7</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="8" id="<?php echo $row['cod_area']."8"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."8"; ?>" class="css-label radGroup2">8</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="9" id="<?php echo $row['cod_area']."9"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."9"; ?>" class="css-label radGroup2">9</label>
 </td>
 <td>
 <input type="radio" name="<?php echo $row['cod_area']; ?>" value="10" id="<?php echo $row['cod_area']."10"; ?>" class="css-checkbox"/ required>
 <label for="<?php echo $row['cod_area']."10"; ?>" class="css-label radGroup2">10</label>
 </td>
 </tr>
 </table>
 </div>
 <br>
 </div>
 </div>
 </div>
 <?php endwhile;}}?>
 <input type="hidden" name="id_pergunta" value="<?php echo $id_pergunta?>">
 <?php
 if (!isset($_POST['id_pergunta'])) {
 ?>
 <div class="jumbotron">
 <h1>Erro 404!</h1>
 <p>Infelizmente não encontramos o que você procura, tente em outro lugar, quem sabe.</p>
 <a class="btn btn-info btn-lg" onClick="history.go(-1)" role="button">Voltar
 <span class="glyphicon glyphicon-arrow-left"></span>
 </a>
 <a class="btn btn-info btn-lg" href="index.php" role="button">Início
 <span class="glyphicon glyphicon-home"></span>
 </a>
 </div> <?php
 } else
 {
 ?>
 <button type="submit" href="#modal-dialog" data-toggle="modal" class="btn btn-success">Confirmar
 <span class="glyphicon glyphicon-ok"></span>
 </button>
 <a href="index.php" class="btn btn-danger" role="button">Cancelar
 <span class="glyphicon glyphicon-remove"></span>
 </a>
 <?php }?>
 </form>

	E uma página em php para esse formulário postar, functions/update.php

	 

	Minha cruel dúvida é a seguinte: Como eu faço para quando eu responder este formulário exiba um modal com o botão OK e quando eu clicasse nesse modal, ia para a página functions/update.php postar o meu form?