function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		photo1 = newImage("images/photo1.jpg");
		photo2 = newImage("images/photo2.jpg");
		photo3 = newImage("images/photo3.jpg");
		photo4 = newImage("images/photo4.jpg");
		photo5 = newImage("images/photo5.jpg");

		preloadFlag = true;
	}
}