var imagenumber = 6 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "../images/Book4-5_petit.jpg"
images[2] = "../images/Book18-19_petit.jpg"
images[3] = "../images/Book32-33_petit.jpg"
images[4] = "../images/Book4-5_petit.jpg"
images[5] = "../images/Book18-19_petit.jpg"
images[6] = "../images/Book32-33_petit.jpg"
var image = images[rand1]

images1 = new Array
images1[1] = "../images/Book14-15_petit.jpg"
images1[2] = "../images/Book22-23_petit.jpg"
images1[3] = "../images/Book12-13_petit.jpg"
images1[4] = "../images/Book12-13_petit.jpg"
images1[5] = "../images/Book14-15_petit.jpg"
images1[6] = "../images/Book22-23_petit.jpg"
var image1 = images1[rand1]