@Override
	public void mouseClicked(MouseEvent arg0) {
		// TODO Auto-generated method stub
		int x = arg0.getX()-xOffset;
		int y = arg0.getY()-yOffset;
		for(int i=0; i<books.size(); i++){
			if(books.get(i).contains(x, y)){
				books.get(i).toggleSelection();
			}
		}
		
		this.repaint();
	}