Editor on other domain than the wiki

I want to use Fckeditor for the oddmuse wiki. But the wiki should be at https://wiki.somewhere.de/ to be secure.
Fckeditors is big and should be cached by the Browser and be loaded from a faster location http://somewhere.de/fckeditor/

Is this possible? I have set the BaseHref to http://somewhere.de/fckeditor. But this doesnt help, the textarea gets replaced by nothing.

Thank you!
Flo