Cool Megamenu is a user-friendly, highly customizable responsive Mega Menu WordPress plugin. It works out of the box with the WordPress 3 Menu System, making it simple to get started but powerful enough to create highly customized and creative mega menu configurations. Note: Use <?php cool_nav_menu(array('theme_location' => 'primary')); ?> instead of <?php wp_nav_menu(array('theme_location' => 'primary')); ?>. You can ask your questions here