function register_adaptive_menus() {
register_nav_menus(array(
'top-menu' => __( 'Top Menu', 'adaptive-framework' ),
'main-menu' => __( 'Main Menu', 'adaptive-framework' )
));
}
add_action( 'init', 'register_adaptive_menus' );

<nav class="top-menu-navigation clearfix">
<?php wp_nav_menu(array(
'theme-location' => 'top-menu'
)); ?>
</nav>

<nav class="main-navigation clearfix">
<?php wp_nav_menu(array(
'theme-location' => 'main-menu'
)); ?>
</nav>