I have opted for the second version with the larger screen for displaying Sacred Scripture texts, prayers and mystery images.

Everything from this point is minor tweaking. If you get to the end of a set of mysteries, clicking "next" will bring you to the beginning of the next set. I am planning on adding a fast skip and the option to select different mystery images. I also plan to add a block of Javascript that will cache the images when it first loads a mystery so that subsequent mysteries function instantly. In due time ...

The code is more readable now but needs some commenting. Just view source ...