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) {
		butt_01_over = newImage("images/butt_01-over.jpg");
		butt_02_over = newImage("images/butt_02-over.jpg");
		butt_03_over = newImage("images/butt_03-over.jpg");
		butt_04_over = newImage("images/butt_04-over.jpg");
		butt_05_over = newImage("images/butt_05-over.jpg");
		butt_06_over = newImage("images/butt_06-over.jpg");
		preloadFlag = true;
	}
}