Here you go.
<?php if (!defined('FLUX_ROOT')) exit; ?>
<?php $subMenuItems = $this->getSubMenuItems(); $menus = array() ?>
<?php if (!empty($subMenuItems)): ?>
<div id="submenu">Menu:
<select onchange="window.location.href=this.value">
<?php foreach ($subMenuItems as $menuItem): ?>
<?php echo sprintf('<option value="%s"%s>%s</option>',
$this->url($menuItem['module'], $menuItem['action']),
$params->get('module') == $menuItem['module'] && $params->get('action') == $menuItem['action'] ? ' selected="selected"' : '',
htmlspecialchars($menuItem['name'])); ?>
<?php endforeach ?>
</select>
</div>
<?php endif ?>