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) {
		netD_05_over = newImage("images/netD_05-over.gif");
		netD_06_over = newImage("images/netD_06-over.gif");
		netD_06_down = newImage("images/netD_06-down.gif");
		netD_07_over = newImage("images/netD_07-over.gif");
		netD_07_down = newImage("images/netD_07-down.gif");
		netD_08_over = newImage("images/netD_08-over.gif");
		netD_08_down = newImage("images/netD_08-down.gif");
		netD_09_over = newImage("images/netD_09-over.jpg");
		netD_09_down = newImage("images/netD_09-down.jpg");
		netD_10_over = newImage("images/netD_10-over.gif");
		netD_10_down = newImage("images/netD_10-down.gif");
		preloadFlag = true;
	}
}