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) {
              loader = newImage("showcase/loading.gif");
		title_over = newImage("images/title_off.gif");
		title2_over = newImage("images/top_off.gif");
		title3_over = newImage("images/left_off.gif");
		button_03_over = newImage("images/button_03-over.gif");
		button_05_over = newImage("images/button_05-over.gif");
		button_06_over = newImage("images/button_06-over.gif");
		button_07_over = newImage("images/button_07-over.gif");
		button_09_over = newImage("images/button_09-over.gif");
		button_10_over = newImage("images/button_10-over.gif");
		button_11_over = newImage("images/button_11-over.gif");
		button_13_over = newImage("images/button_13-over.gif");
		button_15_over = newImage("images/button_15-over.gif");
		button_press_over = newImage("images/button_press-over.gif");
		button_rp_over = newImage("images/button_rp-over.gif");
		previous_over = newImage("images/previous-over.gif");
		next_over = newImage("images/next-over.gif");
		preloadFlag = true;
	}
}
function navBack() {location.href="main.html";}