Page backgrounds
If you wish you can have the background change when your book pages change.
Upto V1.39 you can define any number of backgrounds between the <content> and </content> tags in pages.xml. From V1.41 the background definitions are kept in a separate file xml/Backgrounds.xml.
<background id="sample05" src="backgrounds/sample05.jpg"/>
<background id="image1" src="backgrounds/image1.jpg"/>
<background id="image2" src="backgrounds/image2.jpg"/>
<background id="image3" src="backgrounds/image3.jpg"/>
<background id="image5" src="backgrounds/image5.jpg"/>
<background id="wood" src="backgrounds/wood.png"/>
The id attribute is used to apply the background image when required. Within a <page> tag in xml/pages.xml you can then specify the background for that page using:-
<page bkgnd="wood" ...>
The book background will then change when that page is opened.