FCKEditor + MediaWiki: link to advanced text editor missing

I downloaded FCKEditor 2.6.4 form here http://www.fckeditor.net/download. Then unzipped it to /extentions directory. Next i edited LocalSettings.php and added the following:

# use AJAX
$wgUseAjax = 1;

#FCKEditor
require_once("$IP/extensions/fckeditor/fckeditor.php");

# Ссылки на переключение с рич-редактора на стандартный
$wgDefaultUserOptions['riched_use_toggle'] = 1;

# По умолчанию отключен рич-редактор
$wgDefaultUserOptions['riched_start_disabled'] = 0;

# Появиться ссылка для возможности открытия в новом окне рич-редактор
$wgDefaultUserOptions['riched_use_popup'] = 1;

# Помнить ваш выбор (рич/стандарт)
$wgDefaultUserOptions['riched_toggle_remember_state'] = 1;

$wgFCKEditorExtDir = "extentions/fckeditor"; # path to FCKeditor extension. Defaults to extensions/FCKeditor.
$wgFCKEditorDir = "extentions/fckeditor/editor"; # path to the actual FCKeditor. Defaults to extensions/FCKeditor/fckeditor/
$wgFCKEditorToolbarSet = ""; # defaults to 'Wiki'.
$wgFCKEditorHeight = "300"; # for automatic ('300' minimum). Defaults to '0'.