images = new Array(5);

images[0] = "<img src='/images/aust1.jpg' alt='Australia' border='0'>";

images[1] = "<img src='/images/aust2.jpg' alt='Australia' border='0'>";

images[2] = "<img src='/images/aust3.jpg' alt='Australia' border='0'>";

images[3] = "<img src='/images/aust4.jpg' alt='Australia' border='0'>";

images[4] = "<img src='/images/aust5.jpg' alt='Australia' border='0'>";

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

document.write(images[index]);