function mapa()
{
	var left, top, x, y;
	x = 762;
	y = 441;
	left = Math.round((screen.width - x) / 2);
	top = Math.round((screen.height - y) / 2);
	window.open('mapa.php', 'nazwa','width='+x+', height='+y+', top='+top+', left='+left+', resizable=no, scrollbars=no, menubar=no, status=no');	
}