@eschwartz: This should take care of the headers:
https://github.com/kovidgoyal/calibr...7a0be6fba3459c
As for the go back to details page, I'm confused. What X? When there is an error opening a book, a popup is displayed with the error message. When you click the X on the popup it is closed and you are left ona page that says something like:
Could not open book...click to go back to book details
There is no X there?