public String next() {
	String url = null;
	Node parent = current.getParent();
	if (parent != null) {
	    int lenght = current.subNode.size();
	    Node next = null;
	    for (int i = 0; i < lenght; i++) {
		if (current.getURL().equals(next = current.subNode.get(i))) {
		    return next.getURL();
		}
	    }

	} else {

	}

	return url;
    }