images = new Array(4);

images[0] = "<img src='images/AHHD_Xbox360_016_w800.jpg' id='screenCap' />";
images[1] = "<img src='images/AHHD_Xbox360_105_w800.jpg' id='screenCap' />";
images[2] = "<img src='images/AHHD_Xbox360_380_w800.jpg' id='screenCap' />";
images[3] = "<img src='images/AHHD_Xbox360_501_w800.jpg' id='screenCap' />";
index = Math.floor(Math.random() * images.length);

function randomImage() {
	document.write(images[index]);
}