Janela Modal para edição

Boa tarde

Estou tentando fazer um cadastro de usuários, ele cadastra via modal, mas não edita, preciso de uma ajuda:

<?php
 if (isset($_POST['atualizar'])):

 $id = $_POST['id'];
 $nome = $_POST['nome'];
 $email = $_POST['email'];
 $login = $_POST['login'];
 $senha = $_POST['senha'];
 $nivel = $_POST['nivel'];

 $usuario->setNome($nome);
 $usuario->setEmail($email);
 $usuario->setLogin($login);
 $usuario->setSenha($senha);
 $usuario->setNivel($nivel);

 if ($usuario->update($id)) {
// echo "Atualizado com sucesso!";
 }

 endif;
 ?>

 <?php
 if (isset($_GET['acao']) && $_GET['acao'] == 'deletar'):

 $id = (int) $_GET['id'];
 if ($usuario->delete($id)) {
// echo "Deletado com sucesso!"
// ;
 }

 endif;
 ?>

 <?php
 if (isset($_GET['acao']) && $_GET['acao'] == 'editar') {

 $id = (int) $_GET['id'];
 $resultado = $usuario->find($id);
 ?>

 <div id="ModalEditar" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
 <div class="modal-header">
 <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
 <h3 id="myModalLabel">Cadastrar </h3>
 </div>
 <div class="modal-body">
 <p>
 <div class="box-content">
 <!--Editar-->

 <form class="form-horizontal" method="post" action="">
 <fieldset>

 <div class="control-group">
 <label class="control-label" for="prependedInput">Nome </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-user"></i></span>
 <input id="prependedInput" size="16" type="text" name="nome" value="<?php echo $resultado->nome; ?>" autofocus="">
 </div>
 </div>
 </div>

 <div class="control-group">
 <label class="control-label" for="prependedInput">E-mail </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-envelope"></i></span>
 <input id="prependedInput" size="16" type="email" name="email" value="<?php echo $resultado->email; ?>">
 </div>
 </div>
 </div>

 <div class="control-group">
 <label class="control-label" for="prependedInput">Login </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-briefcase"></i></span>
 <input id="prependedInput" size="16" type="text" name="login" value="<?php echo $resultado->login; ?>">
 </div>
 </div>
 </div>

 <div class="control-group">
 <label class="control-label" for="prependedInput">Senha </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-lock"></i></span>
 <input id="prependedInput" size="16" type="password" name="senha" value="<?php echo $resultado->senha; ?>">
 </div>
 </div>
 </div>

 <div class="control-group">
 <label class="control-label" for="selectError3">Nível </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-eye-open"></i></span>
 <select id="selectError3" name="nivel" value="<?php echo $resultado->nivel; ?>">
 <option value="10">Desativado</option>
 <option value="2">Moderador</option>
 <option value="1">Administrador</option></select>
 </select>
 </div>
 </div>
 </div>
 </div></p>
 </div>
 <div class="modal-footer">
 <input type="hidden" name="id" value="<?php echo $resultado->id; ?>">
 <input type="submit" name="atualizar" class="btn btn-primary" value="Salvar mudanças">
 <button class="btn" data-dismiss="modal" aria-hidden="true">Fechar</button>
 </fieldset></form>
 <!--Fim editar--> </div>

 </div>

 <?php } else { ?>

<!-- Modal -->

 <div id="myModalAdicionar" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
 <div class="modal-header">
 <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
 <h3 id="myModalLabel">Cadastrar </h3>
 </div>
 <div class="modal-body">
 <p>
 <div class="box-content">
 <form class="form-horizontal" method="post" action="">
 <fieldset>

 <div class="control-group">
 <label class="control-label" for="prependedInput">Nome </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-user"></i></span>
 <input id="prependedInput" size="16" type="text" name="nome" placeholder="Nome" autofocus="">
 </div>
 </div>
 </div>

 <div class="control-group">
 <label class="control-label" for="prependedInput">E-mail </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-envelope"></i></span>
 <input id="prependedInput" size="16" type="email" name="email" placeholder="E-mail">
 </div>
 </div>
 </div>

 <div class="control-group">
 <label class="control-label" for="prependedInput">Login </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-briefcase"></i></span>
 <input id="prependedInput" size="16" type="text" name="login" placeholder="Login">
 </div>
 </div>
 </div>

 <div class="control-group">
 <label class="control-label" for="prependedInput">Senha </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-lock"></i></span>
 <input id="prependedInput" size="16" type="password" name="senha" placeholder="Senha">
 </div>
 </div>
 </div>

 <div class="control-group">
 <label class="control-label" for="selectError3">Nível </label>
 <div class="controls">
 <div class="input-prepend">
 <span class="add-on"><i class="icon-eye-open"></i></span>
 <select id="selectError3" name="nivel">
 <option value="10">Desativado</option>
 <option value="2">Moderador</option>
 <option value="1">Administrador</option></select>
 </div>
 </div>
 </div>
 </div></p>
 </div>
 <div class="modal-footer">
 <input type="submit" name="cadastrar" class="btn btn-primary" value="Salvar mudanças">
 <button class="btn" data-dismiss="modal" aria-hidden="true">Fechar</button>
 </fieldset></form>
 <?php } ?>
 </div>
 </div>

<!--Exibir dados-->

 <div class="row-fluid sortable">
 <div class="box span12">
 <div class="box-header" data-original-title>
 <h2><i class="halflings-icon white user"></i><span class="break"></span>Visualizar usuários</h2>
 <div class="box-icon">

 <a href="#" class="btn-minimize"><i class="halflings-icon white chevron-up"></i></a>
 <a href="#" class="btn-close"><i class="halflings-icon white remove"></i></a>
 </div>
 </div>
 <div class="box-content">

 <!-- Button to trigger modal -->
 <p><a href="#myModalAdicionar" role="button" class="btn btn-primary" data-toggle="modal">Cadastrar</a></p>

 <table class="table table-striped table-bordered bootstrap-datatable datatable">
 <thead>
 <tr>
 <th>Nome</th>
 <th>Email</th>
 <th>Login</th>
 <th>Senha</th>
 <th>Nivel</th>
 <th>Ações</th>
 </tr>
 </thead>

 <tbody>
 <?php foreach ($usuario->findAll() as $key => $value): ?>

 <tr>

 <td><?php echo $value->nome; ?></td>
 <td><?php echo $value->email; ?></td>
 <td><?php echo $value->login; ?></td>
 <td><?php echo $value->senha; ?></td>
 <td><?php echo $value->nivel; ?></td>
 <td>

 <a href="usuarios.php?acao=editar&id=<?php echo $value->id; ?>" data-toggle="modal" data-target="ModalEditar" class="btn btn-warning"><i class="halflings-icon white edit"></i></a>
 <a href="usuarios.php?acao=deletar&id=<?php echo $value->id; ?>" class="btn btn-danger" onclick="return confirm('Deseja realmente deletar?');"><i class="halflings-icon white trash"></i></a>
 </td>
 </tr>
 <?php endforeach; ?>
 </tbody> </table>

Duvida preciso de jQuery ou consigo fazer só com o php?

A chamada para editar está na linha 406.