If you want to make a flex book online, I advise you to use ruben work
Demo:
http://www.rubenswieringa.com/code/as3/flex/Book/simple/
Now if you want to use this book on your desktop with air, it's very simple
With flex builder, just save your new Flex project as a Dektop application.
And replace the code by this (I reducted the code for a best reading):
<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
xmlns:filters="flash.filters.*"
xmlns:rs="com.rubenswieringa.book.*"
backgroundColor="#333333">
<rs:Book id="myBook" width="450" height="300"
openAt="0" autoFlipDuration="600" easing="0.7" regionSize="50"
sideFlip="true" hardCover="true" hover="true" snap="false" flipOnClick="true">
<rs:Page><mx:Image source="@Embed('assets/img/1.jpg')" /></rs:Page>
<rs:Page><mx:Image source="@Embed('assets/img/2.jpg')" /></rs:Page>
<rs:Page><mx:Image source="@Embed('assets/img/3.jpg')" /></rs:Page>
<rs:Page ><mx:Image source="@Embed('assets/img/4.jpg')" /></rs:Page>
<rs:Page ><mx:Image source="@Embed('assets/img/5.jpg')" /></rs:Page>
<rs:Page ><mx:Image source="@Embed('assets/img/6.jpg')" /></rs:Page>
</rs:Book>
</mx:WindowedApplication>
Put your images on the folder assets/img (1.jpg ...)
If you want to use the full mxml code of ruben example, juste replace Application.application by parentApplication