A couple of comments:

I had to modify the main source file (GnuBook.js and GnuBook.css) to replace the calls for the various button images. My Web server doesn’t allow hierarchical directories; everything has to go through a function, so I had to change each instance of “images/left-button.png” to “images?imgname=left-button.png”. It would be nice if all those UI images were fetched through a Javascript function which I could override in my book-specific JS file.

I couldn’t go to the end of the book in two-page mode till I overrode lastDisplayableIndex() in my code — there seems to be some idea in the code that the last couple of pages can’t be displayed in two-page mode.

I’d like to be able to override the logo image and URL in the upper left corner with my own logo and link. It would be nice to have hooks to do this.

How about text selection? In UpLib, we had to implement “wordboxes” to do that — basically, a description mapping each word in the text to a rectangle on the page image.

http://github.com/openlibrary/bookreader/tree/master

The GnuBookDemo works OK after modifying the url var in GnuBookSimpleJS.js. So I have tried to modify the index.php in GnuBookIA, but got into some problems. There are a setup.inc file in index.php and I wonder what kind of information/data/variables that are initiated in setup.inc file