retgef

<?php
define('WYSIWYG_META_BOX_ID', 'my-editor');
define('WYSIWYG_EDITOR_ID', 'myeditor'); //Important for CSS that this is different
define('WYSIWYG_META_KEY', 'extra-content');

add_action('admin_init', 'wysiwyg_register_meta_box');
function wysiwyg_register_meta_box(){
        add_meta_box(WYSIWYG_META_BOX_ID, __('WYSIWYG Meta Box', 'wysiwyg'), 'wysiwyg_render_meta_box', 'post');
}