var imagenumber =4 ; //This is the total number of images available
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "/dofd/images/overview1.jpg" //these are the images themselves
images[2] = "/dofd/images/volume1a.jpg"
images[3] = "/dofd/images/volume2a.jpg"
images[4] = "/dofd/images/overview4.jpg"
var image = images[rand1]