Blank FCKeditor in Firefox

Hi there,

I've found an instance of FCKeditor behaving rather strange in Firefox. For some reason, the editor won't show up at all and there is just a blank space for the editor on the parent page. In the IE, everything works fine.

This happens when I copied another instance from one of my other script to this new one. I also copied the FCKeditor directory and configuration files and modified them correctly to suit the new directory structure. In the original script, the editor works fine with Firefox and IE - so I can't figure out that what's the problem in this new script.

The differences (that I find significant) with the working original script and this new not-working script follow:
- the FCKeditor instance (PHP) is called inside an include file and inside a function
- the FCKeditor and the calling script are one subdirectory deeper in the directory structure

The differences above should not be browser-dependent, so they should not affect the behaviour of FCKeditor on Firefox.

There is no error messages to help me to track the source of the problem, not from the server-side or the client-side (Javascript).

Thanks for help !

Ville