Background

For a background image behind your book, use the background child element of book.

<book...>

   <background>
        <box anchors="0,0,pw,ph" background="image(../images/background/bk4.jpg)"/>
   </background>
   .
   .
   .

</book>

To remove the horizontal line (gradient), set the book element "bggradient" to false.

<book... bggradient="false"...> . . . </book>

To remove the reflection, set the book element "reflection" to false.

<book... reflection="false"...> . . . </book>