Spread on mini book

Hi, this is a link from an earlier post: http://www.prestophoto.com/photos/image/151724/1046 , or better yet:
http://www.prestophoto.com/photos/gallery/11323

I would like to put an image across two pages of a 5x7 mini book.
How should I do to be sure to have my whole image, is there a safety ?
Thank you.