How to set the base URL for FCKeditor image upload service to domain name

I have FCKEditor for uploading 开发者_如何学Cimages to newsletter, but the images in the editor are placed with relative path.

/uploads/media/1.jpg

How can I enforce to use

http://www.example.org/uploads/media/1.jpg

when creating the HTML content inside the editor.

in "fck/editor/filemanager/connectors/php/config.php"

set this param :

$Config['UserFilesPath'] = "http://www.example.org/"