function nowe_okno(elm, name){
var wnd = window.open(typeof elm == 'string' ? el : elm.href, typeof name != 'undefined' ? name : '', 'menubar=yes,toolbar=yes,location=yes,directories=no,status=yes,scrollbars=yes,resizable=yes');
	if (!wnd) return false;
		wnd.focus();
			return true;
}

function pokaz_kontakt(){
	document.getElementById('srodek_info').style.display = 'none';
	document.getElementById('srodek_kontakt').style.display = 'block';
}