images = new Array(6);

images[0] = "<img src='../Images/image1.jpg' alt=''>";

images[1] = "<img src='../Images/image2.jpg' alt=''>";

images[2] = "<img src='../Images/image3.jpg' alt=''>";

images[3] = "<img src='../Images/image4.jpg' alt=''>";

images[4] = "<img src='../Images/image5.jpg' alt=''>";

images[5] = "<img src='../Images/image6.jpg' alt=''>";

index = Math.floor(Math.random() * images.length);

document.write(images[index]);