<?php

 
$nav_menu = ( $menu !='' ) ? wp_get_nav_menu_object( $menu ) :false;

$menuid  = is_object($nav_menu)&& $nav_menu->slug ? $nav_menu->slug : 'topmenu';

$layout = isset($layout) ? $layout : "style_1";

if(!$nav_menu) return false;
$postion_class = ($position=='left')?'menu-left':'menu-right';
$args = array(  'menu' => $menuid,
                'container_class' => 'collapse navbar-collapse navbar-ex1-collapse vertical-menu '.$postion_class,
                'menu_class' => 'nav navbar-nav megamenu',
                'fallback_cb' => '',
                'walker' => class_exists("Wpopal_Themer_Megamenu_Vertical") ? new Wpopal_Themer_Megamenu_Vertical($nav_menu->term_id):null );

if ( $title ) {
    echo ($before_title)  . trim( $title ) . $after_title;
}
?>
<?php wp_nav_menu($args); ?>