WordPressTheme_functions.php

<?php

register_sidebar(array(
    'name' => 'Right Sidebar',
    'id'    =>'right_sidebar',
    'before_widget' => '<div>',
    'after_widgit' => '</div>',
));

register_sidebar(array(
    'name' => 'Second Right Sidebar',
    'id'    =>'second_right_sidebar',
//    'before_widget' => '<div>',
//    'after_widgit' => '</div>',
));

/* // Register 2 menus
function register_my_menus() {
  register_nav_menus(
    array(
      'header-menu' => __( 'Header Menu' ),
      'extra-menu' => __( 'Extra Menu' )
    )
  );
}
add_action( 'init', 'register_my_menus' );
*/

/*
// in the theme files
<?php wp_nav_menu( array( 'theme_location' => 'header-menu' ) ); ?>
*/