public void deleteAdmin(int index){
		if (getAdminSize()==1)
			JOptionPane.showMessageDialog(null, "There should be at least one Admin user, user is not deleted","Delete", JOptionPane.ERROR_MESSAGE);
		else{
			admin.remove(index);
			JOptionPane.showMessageDialog(null, "Admin is deleted","Delete", JOptionPane.PLAIN_MESSAGE);
		}
	}