images = new Array(7);
images[0] = "<img src='/img/header/headerImgSub-1.jpg' alt='RoeTech'><br>";
images[1] = "<img src='/img/header/headerImgSub-2.jpg' alt='RoeTech'><br>";
images[2] = "<img src='/img/header/headerImgSub-3.jpg' alt='RoeTech'><br>";
images[3] = "<img src='/img/header/headerImgSub-4.jpg' alt='RoeTech'><br>";
images[4] = "<img src='/img/header/headerImgSub-5.jpg' alt='RoeTech'><br>";
images[5] = "<img src='/img/header/headerImgSub-6.jpg' alt='RoeTech'><br>";
images[6] = "<img src='/img/header/headerImgSub-7.jpg' alt='RoeTech'><br>";

function getRandomImage() {
	index = Math.floor(Math.random() * images.length);
	document.write(images[index]);
}