function fb(en) {
	var w = 630;
	var h = 510;
	var l = Math.round((screen.width - w) / 2);
	var t = Math.round((screen.height - h) / 2) - 40;
	var opt = 'status=yes,menubar=no,toolbar=no,resizable=yes,scrollbars=yes,location=no';
	opt += ',width=' + w;
	opt += ',height=' + h;
	opt += ',left=' + l;
	opt += ',top=' + t;
	var wn = 'fb' + Math.floor(Math.random() * 1000)
	var d = en ? '/cgi-bin/feedback.pl?l=en' : '/cgi-bin/feedback.pl'
	var win = window.open(d, wn, opt);
	win.focus();
	return(win);
}