function print_info(id_polozky) {
		w = 700;
		h = 600;
		meta_h = 40;

		wtop = Math.round((screen.height - h - meta_h) / 2) - meta_h;
		wleft = Math.round((screen.width - w) / 2);
			
		info = window.open('http://localhost/print_info.php?itemID=' + id_polozky, '', 'width=' + w + ', height=' + h + ',resizable=no,scrollbars=1,status=0,top=' + wtop + ',left=' + wleft);
	}
	
	function print_training(id_skoleni) {
		w = 700;
		h = 600;
		meta_h = 40;

		wtop = Math.round((screen.height - h - meta_h) / 2) - meta_h;
		wleft = Math.round((screen.width - w) / 2);
			
		info = window.open('http://localhost/print_training.php?trainingID=' + id_skoleni, '', 'width=' + w + ', height=' + h + ',resizable=no,scrollbars=1,status=0,top=' + wtop + ',left=' + wleft);
	}