var imagenumber = 16 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array ;
images[1] = "images/images_random/Image1.jpg";
images[2] = "images/images_random/Image2.jpg";
images[3] = "images/images_random/Image3.jpg";
images[4] = "images/images_random/efteraar2004_053.jpg";
images[5] = "images/images_random/efteraar2004_063.jpg";
images[6] = "images/images_random/Hedeland038_2003.jpg";
images[7] = "images/images_random/Image7.jpg";
images[8] = "images/images_random/Idre_10.jpg";
images[9] = "images/images_random/P1240035.jpg";
images[10] = "images/images_random/Image10.jpg";
images[11] = "images/images_random/Image11.jpg";
images[12] = "images/images_random/Image12.jpg";
images[13] = "images/images_random/Image13.jpg";
images[14] = "images/images_random/P1240037.jpg";
images[15] = "images/images_random/Reersoe_2.jpg";
images[16] = "images/images_random/reersoe_100.jpg";

var image = images[rand1];