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) {
		gameNav_01_over = newImage("images/gameNav_01_over.gif");
		gameNav_02_over = newImage("images/gameNav_02_over.gif");
		gameNav_03_over = newImage("images/gameNav_03_over.gif");
		gameNav_04_over = newImage("images/gameNav_04_over.gif");
		gameNav_05_over = newImage("images/gameNav_05_over.gif");
		gameNav_06_over = newImage("images/gameNav_06_over.gif");
		gameNav_07_over = newImage("images/gameNav_07_over.gif");
		storyNav_01_over = newImage("images/storyNav_01_over.gif");
		storyNav_02_over = newImage("images/storyNav_02_over.gif");
		storyNav_03_over = newImage("images/storyNav_03_over.gif");
		storyNav_04_over = newImage("images/storyNav_04_over.gif");
		storyNav_05_over = newImage("images/storyNav_05_over.gif");
		storyNav_06_over = newImage("images/storyNav_06_over.gif");
		storyNav_07_over = newImage("images/storyNav_07_over.gif");
		preloadFlag = true;
	}
}