Create the Mobile Navigation Menu

functions.php

add_action( 'genesis_before_header', 'gst_do_mobilenav' );
/**
 * Create the Mobile Navigation Menu.
 *
 * @author Brad Potter
 * 
 * @link http://www.bradpotter.com
 *
 * Based on code from the StudioPress Genesis Framework 2.0
 */
function gst_do_mobilenav() {

	//* Do nothing if menu not supported
	if ( ! genesis_nav_menu_supported( 'mobile' ) )
		return;

	//* If menu is assigned to theme location, output
	if ( has_nav_menu( 'mobile' ) ) {

		$class = 'menu genesis-nav-menu menu-mobile';
		if ( genesis_superfish_enabled() )
			$class .= ' js-superfish';

		$args = array(
			'theme_location' => 'mobile',
			'container'      => '',
			'menu_class'     => $class,
			'echo'           => 0,
		);

		$mobilenav = wp_nav_menu( $args );

		//* Do nothing if there is nothing to show
		if ( ! $mobilenav )
			return;

		$mobilenav_markup_open = genesis_markup( array(
			'html5'   => '<nav %s>',
			'xhtml'   => '<div id="mobilenav">',
			'context' => 'nav-mobile',
			'echo'    => false,
		) );
		
		$mobilenav_markup_open .= genesis_structural_wrap( 'menu-mobile', 'open', 0 );

		$mobilenav_markup_close  = genesis_structural_wrap( 'menu-mobile', 'close', 0 );
		$mobilenav_markup_close .= genesis_html5() ? '</nav>' : '</div>';

		$mobilenav_output = $mobilenav_markup_open . $mobilenav . $mobilenav_markup_close;

		echo apply_filters( 'gst_do_mobilenav', $mobilenav_output, $mobilenav, $args );

	}

}