CKFinder on another domain

CKFinder.setupCKEditor(null, 'http://common/');

But now I've got another one.
CKFinder calls error when it performs on ckfinder/ckfinder.html here (line 93):

if ( parentWindow['CKEDITOR'] )

So FireFox displays:

@8?BC >B:070=> 2 @07@5H5=88 =0 ?>;CG5=85 A2>9AB20 Window.CKEDITOR 87

As the result CKFinder's child window is empty. Where should I check?

I've done dusty job instead developers again.
File ckfinder.html in case 'ckeditor' have variable parentWindow wich causes error in Firefox3.6, IE8 in line. parentWindow have been changed to window.parent ant there is OK. Maybe it causes thanks to integration with CKEditor, doesn't it?