/*
 * show page in popup window.
 */
function popupWindow(url) {
	// setting object.
	var setting = {
		guid: 'robin_with_his_100_friends',
		width: 750,
		height: 630
	};

	// popup & focus the window.
	var popup = window.open(url, setting.guid, 'status=yes,toolbar=no,location=yes,menubar=yes,scrollbars=yes,resizable=yes,width='+ setting.width +',height='+ setting.height);
	popup.focus();
}