images = new Array(5);

images[0] = "<img src='images/01.jpg'>";

images[1] = "<img src='images/02.jpg'>";

images[2] = "<img src='images/03.jpg'>";

images[3] = "<img src='images/04.jpg'>";

images[4] = "<img src='images/05.jpg'>";

images[5] = "<img src='images/06.jpg'>";



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

document.write(images[index]);