WYSIWYG Editor for your custom box

If you have a custom text box in the edit post page, and you want to have the built-in editor, it’s quite easy to do.
<?php
the_editor($content,’id’);

deprecated

use

wp_editor($content,’id’ . $post->ID);
?>

To get ajax data, you can call global tinyMCE object
tinyMCE.get(node_id).getContent();