/**
   * ==============================================================================
   *                       INSERT CLASSES IN TO NAV ITEMS
   * ==============================================================================
   */

  /**
   * Store class names in menu description field.
   * Used, eg. to make a nav item hidden
   */

  /**
   * Descriptions on Header Menu
   * @author Bill Erickson
   * @link http://www.billerickson.net/code/add-description-to-wordpress-menu-items/
   *
   * @param string $item_output, HTML outputp for the menu item
   * @param object $item, menu item object
   * @param int $depth, depth in menu structure
   * @param object $args, arguments passed to wp_nav_menu()
   * @return string $item_output
   */

  // Use menu item description field to store class name for output to link
  function be_header_menu_desc( $item_output, $item, $depth, $args ) {

    // Only if menu is footermenu1
    if( 'footermenu1' == $args->theme_location && ! $depth && $item->description )
        $item_output = str_replace( '<a ', '<a ' . $item->description .' ', $item_output );

    return $item_output;
  }
  add_filter( 'walker_nav_menu_start_el', 'be_header_menu_desc', 10, 4 );