在wordpress下拉列表的ul周围添加<div>

Question

In my HTML before converting to wordpress I had two divs surrounding the UL element, but now as wordpress is automatically creating the dropdown nav, I need to define it to add these two divs (and the second div's CLASS) around the generated UL.

I've included the original HTML of my nav as it should be used.

live site: http://bit.ly/1k90oaO

HTML

<ul class="nav">
<li class="active">
    <a href="/HTML/index.php" class="active">HOME</a>
</li>
<li>
    <a href="/parts.php">PARTS</a>
    <div>
        <div class="nav-column">
            <br />
            <ul class="full-width">
                <li class="nav-li-item"><a href="/HTML/parts.php">Beltings &amp; Tensioners</a></li>
                <li class="nav-li-item"><a href="/HTML/parts.php">Beltings &amp; Tensioners</a></li>
            </ul>
        </div>
    </div>
</li>
</ul>

Current setup in wordpress. functions.php

add_theme_support( 'menus' );

function register_theme_menus() {

    register_nav_menus(
        array(
            'header-menu'   =>   __( 'Header Menu' )
        )
    );  
}
add_action( 'init', 'register_theme_menus' );

header.php

<?php
    $args = array(
        'menu'       => 'header-menu',
        'menu_class' => 'nav',
        'container'  => 'true',
    );
    wp_nav_menu( $args );
?>

Answer 1

See the 'items_wrap' option of wp_nav_menu() in codex.