Changing the BaseHref config value without reloading instanc

I'm having a simple, but elusive problem. I've searched the documentation and these forums thoroughly but can't find anything to help me.

I am making an AJAX editor which keeps the same instance of FCKeditor open but allows the user to load one file, close it, and then load another from a different directory.

The problem is that the BaseHref value stays at what it was set to when I created the FCKeditor instance. I tried simply changing the Config["BaseHref"] variable, but it doesn't have any effect. Is there a way to change the BaseHref setting on the fly? If not, how can I easily unload the FCKeditor instance and load another with the new setting?

Thanks a lot!