public String getAtomPropertySelection(byte property) {
		if (iAtom <= 0)
			return null;
		String s = "";
		switch (property) {
		case Atom.UNMOVABLE:
			for (int i = 0; i < iAtom; i++) {
				if (!atom[i].isMovable())
					s += i + " ";
			}
			break;
		case Atom.INVISIBLE:
			for (int i = 0; i < iAtom; i++) {
				if (!atom[i].isVisible())
					s += i + " ";
			}
			break;
		}
		return s.trim();
	}