[webopius]

Hi.

I think you just need to change your image links to be absolute rather than relative.
So, instead of ../images/imagename.jpg, use /image/imagename.jpg.

Then, when you move pages to subfolders, your image references will be based from the site root (/) rather than relative to your subfolder.

If I was developing such a large site, I would be using a Content Management System such as Joomla or Drupal to manage my pages and hierarchy. Editing individual php files is going to create a massive maintenance challenge for you later.