noweOkno=null;
function okno(url,name,w,h){
	if(window.screen){
		aw=screen.availWidth;
		ah=screen.availHeight;
	}else{
		aw=640;
		ah=450;
	} 
	if(noweOkno==null || noweOkno.closed){
              ustawienia="left="+ (aw-w)/2 + "," 
              +"top="+ (ah-h)/2 + ","
              +"screenX="+ (aw-w)/2 + ","
              +"screenY="+ (ah-h)/2 + ","
              +"width="+ w + ","
              +"height="+ h + ","
              +"innerWidth=" + w + ","
              +"innerHeight="+ h +","
              +"toolbar=no,"
              +"location=no,"
              +"directories=no,"
              +"status=no,"
              +"menubar=no,"
              +"scrollbars=yes,"
              +"resizable=no" 
              noweOkno = window.open(url,name,ustawienia);
	}
	noweOkno.focus();
}