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) {
		home_over = newImage("images/home-over.jpg");
		index_03_over = newImage("images/index_03-over.jpg");
		trading_over = newImage("images/trading-over.jpg");
		warehouse_over = newImage("images/warehouse-over.jpg");
		yamatomo_over = newImage("images/yamatomo-over.jpg");
		index_07_over = newImage("images/index_07-over.jpg");
		more_over = newImage("images/more-over.jpg");
		index_19_over = newImage("images/index_19-over.jpg");
		index_31_over = newImage("images/index_31-over.jpg");
		index_33_over = newImage("images/index_33-over.jpg");
		index_35_over = newImage("images/index_35-over.jpg");
		preloadFlag = true;
	}
}