function pop(plik,w,h){
	okno = null;
	
	if(window.screen){
		aw = screen.availWidth;
		ah = screen.availHeight;
	} else {
		aw=640;
		ah=480;
	}
	
	dane="width="+w+",height="+h+",left="
	+(aw-w)/2+",top="
	+(ah-h)/2 
	+",toolbar=no,location=no,directories=no,"
	+"status=no,menubar=no,"
	+"scrollbars=auto,resizable=yes";
	okno=window.open(plik,'pop',dane);
}