function image() {};

image = new image();
number = 0;
image[number++] = "<img src='top.jpg' border='0'>"
image[number++] = "<img src='top1.jpg' border='0'>"
image[number++] = "<img src='top2.jpg' border='0'>"
image[number++] = "<img src='top3.jpg' border='0'>"
image[number++] = "<img src='top4.jpg' border='0'>"
image[number++] = "<img src='top5.jpg' border='0'>"
image[number++] = "<img src='top6.jpg' border='0'>"
image[number++] = "<img src='top7.jpg' border='0'>"

increment = Math.floor(Math.random() * number);