Fix issue of images not loading by tweaking some CSS!

A copy of the working PDF is at: http://www.therobert.org/storage/Files/PHP/index.pdf

![screen shot 2014-03-24 at 9 59 35 pm](https://f.cloud.github.com/assets/1638492/2507974/a030e3b0-b3ca-11e3-914d-48dfd96d0341.png)