var imagewindow = null;
function ImagePopup(fn, width, height) {
	if (imagewindow && !imagewindow.closed) {
		imagewindow.close();
	}
	width+=20;
	height+=20;
	imagewindow = window.open(fn, '', 'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width='+width+',height='+height);
}