var imagenumber = 6;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "images/boven/boven1.jpg"
images[2] = "images/boven/boven2.jpg"
images[3] = "images/boven/boven3.jpg"
images[4] = "images/boven/boven4.jpg"
images[5] = "images/boven/boven5.jpg"
images[6] = "images/boven/boven6.jpg"
var vrandom_image = images[rand1];