FCKeditor integration

Hi
At first, thanks for this great module. I used till now with tinyMCE.
But now I had to switch to FVKeditor, and Image_assist don't insert any image to fckeditor textarea

the first window of image assist is ok - I can see all uploaded images
then I choose some of them, - the second window is still ok, I can see selected image and properties for it
(title, alligen, etc)
But if I press insert button, no image is inserted and javascript error is shown:
"Line 84
Char 5
Error: Can't move focus to the control because it is invisible, not enabled, or of a type that does not accept the focus.
Code:0"

I am using
drupal 4.7.6
image assist module - 4.7.x-1.x-dev 2006-Dec-14
and the latest fck editor - April 7, 2007 - FCKeditor 2.4.2

please can you fix it? Image assist is great module and I believe that it can works with fckeditor. Thanks for you great job!