Absolute Path for Images

Yes, I'm not having a problem saving the actual picture location in the FINAL Hmtl page (I just did an easy Replace command) but in the actual FCKEditor, it's not displaying the image (shows it as a broken link).

For instance, the CMS tool is located in a different domain on the server.

So /ROOT/www.CMSDomain.com/fckeditor/etc/etc

But it's saving the images in another directory: /ROOT/www.some-other-domain.com/userfiles/image/

Now, I've done a quick REPLACE command so that the final HTML code is correct (much like the previous suggestion). But in the actual fckeditor browser, it's not showing the image. Which is why I'd like to add an absolute path for it.