Open jquery_menu/index.php, find:
echo '<link href="'.osc_base_url().'oc-content/plugins/jquery_menu/jquery_menu.css" rel="stylesheet" type="text/css" />';
echo '<script type="text/javascript" src="'.osc_base_url().'oc-content/plugins/jquery_menu/jquery_menu.js"></script>';
replace with:
// echo '<link href="'.osc_base_url().'oc-content/plugins/jquery_menu/jquery_menu.css" rel="stylesheet" type="text/css" />';
// echo '<script type="text/javascript" src="'.osc_base_url().'oc-content/plugins/jquery_menu/jquery_menu.js"></script>';
osc_enqueue_style('jquery_menu', osc_base_url() . 'oc-content/plugins/jquery_menu/jquery_menu.css');
osc_register_script('jquery_menu', osc_base_url() . 'oc-content/plugins/jquery_menu/jquery_menu.js', 'jquery');
osc_enqueue_script('jquery_menu');
This will use the standard enqueue system to make sure jquery.min.js is loaded before any other scripts depending on it.
Regards