How can I change the background image of each page in the booklet plugin?

How can I change the background image of each page in the booklet plugin?

Theoretically I think I understand it, but practically I must be doing something wrong in the syntax. I am still really new to JavaScript in general.  I am assigning each of the (page) div's it's own id, I think I am getting that part right, and then I want to assign each of them a background image in the C.S.S.. But I am not sure how I should do this. does the statement start with a "." or "#", and should it go in or out of .b-loads {parameters?}
  1. .booklet .b-load  {text-align:center; 
  2. .cover {background-image url(images\00c.png)}
  3. #genesis01n0001 {background-image url(images\00c.png)}}
In my HTML
  1. <body>
  2. <div id="mybook">
  3. <div class="b-load">
  4. <div id="cover">
  5. <h1>The Old Testament!</h1>
  6. </div>
  7. <div id="genesis01n0001"> 
  8. <h3>In the beginning God created the heaven and the earth.</h3>
  9. </div>