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) {
		front_01_over = newImage("front/front_01-over.jpg");
		front_02_over = newImage("front/front_02-over.jpg");
		front_03_over = newImage("front/front_03-over.jpg");
		front_04_over = newImage("front/front_04-over.jpg");
		front_05_over = newImage("front/front_05-over.jpg");
		front_06_over = newImage("front/front_06-over.jpg");
		front_07_over = newImage("front/front_07-over.jpg");
		preloadFlag = true;
	}
}