"To add CSS or JS that should be present on all pages, modules should not implement this hook, but declare these files in their .info file."
CSS files can be added to a .info file using the following format:
At the heart of every Deep Zoom Image file lies a tiled image pyramid that allows the rendering engine to pick and choose only the data that is required for a particular view. Each level is significantly smaller than the next, and is loaded as soon as it becomes available. The smooth Seadragon experience is created by progressively loading each new resolution level and seamlessly blending between them.
The Text-Image Linking Environment (TILE) is a web-based tool for creating and editing image-based electronic editions and digital archives of humanities texts.
imagePath String The path for all UI images. This can be absolute or relative. If relative, it must be relative to the HTML page. A change to this value will only affect new viewers. Default is "img/" for the distributed version of this library, and "http://seadragon.com/ajax/0.8/img/" for the version hosted on seadragon.com.
U. Borghoff, P. Rödig, and J. Scheffczyk. Springer-Verlag Berlin Heidelberg, Online-Ausg. edition, (2006)by Uwe M. Borghoff, Peter Rödig, Lothar Schmitz, Jan Scheffczyk.