How to Disable Target tab of a link Dialog?

Hi all!
I have a little need, I'm using Magnolia CMS and this cms uses FCK editor for rich text.
I would like to hide all link tab except for the main one (Internal link / External link).
Current version of FCKEditor in that Magnolia version is 2.6.2 Build 19417.

My problem is that I can not manage to have only the main tab for the link window.

It should be:

FCKConfig.DefaultLinkTarget = '' ;
FCKConfig.LinkDlgHideTarget = true;
FCKConfig.LinkDlgHideAdvanced = true;
FCKConfig.LinkUpload = false;

But when I use that config, default configs are taken, ignoring the whole config set.
Otherwise, when I use the following:

FCKConfig.DefaultLinkTarget = '' ;
FCKConfig.LinkDlgHideTarget = false;
FCKConfig.LinkDlgHideAdvanced = true;
FCKConfig.LinkUpload = false;

my config file is taken but of course the Target tab active.

It can be a bug on this version?