public void remove(int nr) {
		if(first==null) {
			return;
		}
		LinkedNotice show = first;
		for(int i = 0; i<nr; ++i) {
			if(show.getNext().equals(null)) {
				break;
			}else{
				show = show.getNext();
			}
		}
		switch(nr) {
		case 0:
			first = first.getNext();
			if(first!= null) {
				first.setPre(null);
			}
			break;
		default :
			if(show.equals(last)) {
				last = last.getPre();
				if(last!=null) {
					last.setNext(null);
				}
			}else{
				show.setPre(show.getPre().getPre());
				show.getPre().setNext(show);
			}
			break;
		}
	}