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) {
		np_02_over = newImage("images/np_02-over.gif");
		np_04_over = newImage("images/np_04-over.gif");
		np_06_over = newImage("images/np_06-over.gif");
		np_08_over = newImage("images/np_08-over.gif");
		np_10_over = newImage("images/np_10-over.gif");
		np_12_over = newImage("images/np_12-over.gif");
		preloadFlag = true;
	}
}
function popup(url) {
	window.open(url,'popup','width=800,height=700,top=50,left=50,location=no,status=no,toolbar=1,menubar=no,resizable=1,scrollbars=1');
}