var imagenumber = 13 ; 
var randomnumber = Math.random() ; 
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ; 
images = new Array 
images[1] = "images/motive/pp01.jpg" 
images[2] = "images/motive/pp02.jpg" 
images[3] = "images/motive/pp03.jpg" 
images[4] = "images/motive/pp04.jpg" 
images[5] = "images/motive/pp05.jpg" 
images[6] = "images/motive/pp06.jpg" 
images[7] = "images/motive/pp07.jpg" 
images[8] = "images/motive/pp08.jpg" 
images[9] = "images/motive/pp09.jpg" 
images[10] = "images/motive/pp10.jpg" 
images[11] = "images/motive/pp11.jpg" 
images[12] = "images/motive/pp12.jpg" 
images[13] = "images/motive/pp13.jpg" 
var image = images[rand1]