Header Nav Buttons
There are up to two types of graphics for any given propery (Harry Potter, The Hobbit, etc.): category header (required) and header nav buttons (optional).
The header will feature six properties at any given time. There are two graphics required for each: an off and on state. The background for all six is always the same (off state: gradient; on state: solid white). The below example illustrates the example of Warner Archive:

Specifications
- dimensions: 92px x 42px
- format: 8-bit PNG w/ alpha transparency
