Function Validation Confirm - CakePHP

<script type="text/javascript">
              function confirmar() {
                      confirmar = confirm("¿Desea Actualiza el Paciente?")
                  if(confirmar) {

                    document.Person.submit()
                    return true;
                  }else{
                    location.reload(true);
                    return false;

                  }
              }
              </script>
    <div class="form-group col-sm-12">
      <center>
      <?php echo $this->Form->submit('Actualizar', array('class' => 'btn btn-large btn-primary','onClick'=>'return confirmar();')); ?>
    </center>
    </div><!-- .form-group -->