function okno(url) {
	posx = ((screen.width/2)-(580/2));
	posy =((screen.height/2)-(560/2));
	var Win = window.open(url,"displayWindow",'width=500' + ',height=304' + ',status=no,resizable=no,scrollbars=no,menubar=no' );
	Win.moveTo(posx,posy);
}

function zamknij(){
window.close();
}