CKEditor: how to change skin?

[mvlcek]

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

It must be (linefeeds are not needed, but don't hurt)

Code:

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

The code within the double quotes is Javascript (a part of a definition of an associative array).
I'm assuming that CKEDITOR.ENTER_P is a Javascript variable/constant.