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) {
		index15_over = newImage("images/index15-over.jpg");
		index16_over = newImage("images/index16-over.jpg");
		index16_index17_over = newImage("images/index16-index17_over.jpg");
		index17_over = newImage("images/index17-over.jpg");
		index18_over = newImage("images/index18-over.jpg");
		index19_over = newImage("images/index19-over.jpg");
		preloadFlag = true;
	}
}