var imagenumber = 8 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "images/pic1.jpg"
images[2] = "images/pic2.jpg"
images[3] = "images/pic3.jpg"
images[4] = "images/pic4.jpg"
images[5] = "images/pic1.jpg"
images[6] = "images/pic2.jpg"
images[7] = "images/pic3.jpg"
images[8] = "images/pic4.jpg"
var image = images[rand1]