var message="This image cannot be Copied. \nCopyright Seasons Infotech Pvt. Ltd.";

function click(e) {
	if (document.all) {
		if (event.button == 2) {
			alert(message);
			return false;
		}
	}
	if (document.layers) {
		if (e.which == 3) {
			alert(message);
			return false;
		}
	}
}

if (document.layers) {
	document.captureEvents(Event.MOUSEDOWN);
}

document.onmousedown=click;