BasePath File not found

Hello,

test/www/index.php
test/directory/fckeditor/

File index.php :

require_once '../directory/fckeditor/fckeditor_php5.php'; // It's ok
...
$editor = new FCKeditor ($id) ;
$editor->BasePath = '../directory/fckeditor/'; // Don't work

But FCKeditor search the file : "directory/" not "../directory"

The requested URL /directory/fckeditor/editor/fckeditor.html was not found on this server.

That's normal because this file is here : ../directory/editor/fckeditor.html

The function "require_once" have no problem but the BasePath don't found any file.

How to repair this problem ?