var rand1 = 0;
var useRand = 0;
var index = 1;

images = new Array;
images[index] = new Image();
images[index++].src = "images/Snap1.jpg";
images[index] = new Image();
images[index++].src = "images/Snap2.jpg";
images[index] = new Image();
images[index++].src = "images/Snap3.jpg";
images[index] = new Image();
images[index++].src = "images/Snap4.jpg";
images[index] = new Image();
images[index++].src = "images/Snap5.jpg";
images[index] = new Image();
images[index++].src = "images/Snap6.jpg";
images[index] = new Image();
images[index++].src = "images/Snap7.jpg";
images[index] = new Image();
images[index++].src = "images/Snap8.jpg";
images[index] = new Image();
images[index++].src = "images/Snap9.jpg";
images[index] = new Image();
images[index++].src = "images/Snap10.jpg";
images[index] = new Image();
images[index++].src = "images/Snap11.jpg";
images[index] = new Image();
images[index++].src = "images/Snap12.jpg";
images[index] = new Image();
images[index++].src = "images/Snap13.jpg";
images[index] = new Image();
images[index++].src = "images/Snap14.jpg";
images[index] = new Image();
images[index++].src = "images/Snap15.jpg";
images[index] = new Image();
images[index++].src = "images/Snap16.jpg";
images[index] = new Image();
images[index++].src = "images/Snap17.jpg";
images[index] = new Image();
images[index++].src = "images/tiger6.jpg";
images[index] = new Image();
images[index++].src = "images/water_drop.jpg";
images[index] = new Image();
images[index++].src = "images/factory.png";
images[index] = new Image();
images[index++].src = "images/windmill.png";


function swapPic(randimg) {
	var imgnum = images.length - 1;
	do {
		var randnum = Math.random();
		rand1 = Math.round((imgnum - 1) * randnum) + 1;
	} while (rand1 == useRand);
	useRand = rand1;
	randimg.src = images[useRand].src;
}