Modify layout of chapter button in detail view

I must be getting old, I can't see the current chapter images.

The modifications will look like this

![choc_chapter](https://f.cloud.github.com/assets/1930824/2003233/41071f1c-863e-11e3-881e-b22f7486db1a.jpg)

Pos may need an underlay for bright chapter images.