CKEditor: how to change skin?

[Connie]

I want to install other Editor Skin than default.
I see that there is a skin "getsimple" in admin/template/js/ckeditor/skins

I uploaded other skins from a default CKEditor-Installation: kama, office 2003 and silver to the same folder admin\template\js\ckeditor\skins

I defined in gsconfig.php:

Code:

define('GSEDITOROPTIONS', 'enterMode : CKEDITOR.ENTER_P','skin : kama');

with no effect

I defined

Code:

config.skin = 'office2003';

in the config.js, with no effect

where can I define the skin without editing any php-files beside config-files?

I know that other skins work, as I can edit the admin/edit.php

Code:

skin : 'office2003',

but I look for a better configuration-option