function pokaz_okno(adres,szerokosc,wysokosc)
{
	lewo=(screen.width)?(screen.width-szerokosc)/2:100;
	gora=(screen.height)?(screen.height-wysokosc)/2:100;

	window.open(adres,"",'width='+szerokosc+',height='+wysokosc+',top='+gora+',left='+lewo+'toolbar=no, menubar=no, status=no, resizable=no, scrollbars=yes')
}