images = new Array(4);

images[0] = "<img src='../images/home_1.jpg' alt='Home Picture 1'>";

images[1] = "<img src='../images/home_2.jpg' alt='Home Picture 2'>";

images[2] = "<img src='../images/home_3.jpg' alt='Home Picture 3'>";

images[3] = "<img src='../images/home_4.jpg' alt='Home Picture 4'>";

images[4] = "<img src='../images/home_5.jpg' alt='Home Picture 5'>";

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

document.write(images[index]);