var i, images = new Array();

var folder = "/images/phototop/";

images[images.length] = "pic01.jpg";
images[images.length] = "pic02.jpg";
images[images.length] = "pic03.jpg";
images[images.length] = "pic04.jpg";
images[images.length] = "pic05.jpg";
images[images.length] = "pic06.jpg";
images[images.length] = "pic07.jpg";
images[images.length] = "pic08.jpg";
images[images.length] = "pic09.jpg";
images[images.length] = "pic10.jpg";
images[images.length] = "pic11.jpg";
images[images.length] = "pic12.jpg";
images[images.length] = "pic13.jpg";
images[images.length] = "pic14.jpg";

i = parseInt(Math.random()*images.length);
i = (isNaN(i)) ? 0 : i;

document.write("<img src='" + folder + images[i] + "'>");