var aryImages = new Array();

aryImages[0] = "photos/home-1.jpg";
aryImages[1] = "photos/home-2.jpg";
aryImages[2] = "photos/home-3.jpg";

for (i=0; i < aryImages.length; i++) {
	var preload = new Image();
	preload.src = aryImages[i];
}

function swap(imgIndex, imgTarget) {
	document[imgTarget].src = aryImages[imgIndex];
}