var img = new Array();
var imgalt = new Array();

function addImages (imageName, altText) {
	img.push(imageName);
	imgalt.push(altText);
}

function changeImg() {
	var num = Math.floor(Math.random()*img.length);
	var currentImg = document.getElementById("sidepic").getElementsByTagName("Img");
	currentImg[0].src = img[num];
	currentImg[0].alt = imgalt[num];
}

function initImg() {
	addImages("/images/random/planes.jpg", "Pleanes in a sequance.");
	addImages("/images/random/side.jpg", "Silhouette of a man looking at the propeller of a plane.");
	addImages("/images/random/tank.jpg", "Tank moving on a road.");
	addImages("/images/random/truck.jpg", "Truck moving on a road.");
	changeImg();
}