function image() {};
image = new image();
number = 0;
image[number++] = "<img src='images/cowgirlonhorse.jpg' height='87'>"
image[number++] = "<img src='images/mareandfoal100x200.jpg' height='87'>"
image[number++] = "<img src='images/field162x87.jpg' height='87'>"
image[number++] = "<img src='images/driveway-162x87.jpg' height='87'>"
image[number++] = "<img src='images/2002foals-162x87.jpg' height='87'>"
image[number++] = "<img src='images/matswimming-162x87.jpg' height='87'>"
image[number++] = "<img src='images/paintfoal-162x87.jpg' height='87'>"
image[number++] = "<img src='images/sam-162x87.jpg' height='87'>"
image[number++] = "<img src='images/driveway-162x87.jpg' height='87'>"


increment = Math.floor(Math.random() * number);
document.write(image[increment]);