Table of content issues.

I am running OS 10.8.5.version 2.1.1

I cannot seem to change the picture with each chapter of my book like I did in the first version of this when it came out 2 years ago.

How do I do that so I can have a different photograph for each chapter of my book?

I was able to just place a different picture for each chapter there but now when I place the picture in there the same photo goes in every chapter, I think that is odd.