var pictureWindow = null;

function ShowPicture(rel_path) {
	var hyperlink = 'images/'+rel_path;
	var screenheight = screen.height - 200;
	var options = 'status=no, resizable=yes, width='+screenheight+', height='+screenheight+', top=100, left=100, scrollbars=yes';
	if (pictureWindow == null || pictureWindow.closed) {
		pictureWindow = window.open(hyperlink, '', options)
		}
	else {
		pictureWindow.location.href=hyperlink;
		pictureWindow.focus();
		}
	}