<?php
if ( has_nav_menu( 'primary' ) ) {
$args = array(
'theme_location' => 'primary',
'container' => '',
'items_wrap' => '<ul class="root">%3$s</ul>'
);
echo '<nav id="main-nav" class="clearfix">
<div class="container clearfix">';
wp_nav_menu( $args );
echo '</div><!-- .container -->
</nav><!-- #main-nav -->';
}
else {
echo '<nav id="main-nav" class="clearfix">
<div class="container clearfix">';
wp_page_menu( array( 'menu_class' => 'root' ) );
echo '</div><!-- .container -->
</nav><!-- #main-nav -->';
}
?>