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) {
		page_2_08_over = newImage("image/page_2_08-over.gif");
		page_2_09_over = newImage("image/page_2_09-over.gif");
		page_2_10_over = newImage("image/page_2_10-over.gif");
		page_2_12_over = newImage("image/page_2_12-over.gif");
		page_2_13_over = newImage("image/page_2_13-over.gif");
		page_2_15_over = newImage("image/page_2_15-over.gif");
		page_2_16_over = newImage("image/page_2_16-over.gif");
		page_2_20_over = newImage("image/page_2_20-over.gif");
		left_title_2_1_over = newImage("image/left_title_2_1-over.gif");
		left_title_mokuji_28_over = newImage("image/left_title_mokuji_28-over.gif");
		amazon2_38_over = newImage("image/amazon2_38-over.gif")		
		preloadFlag = true;
	}
}