private String getTeacher(List<String> teachers)
	{
		String s = "";
		for(String t : teachers){
			s += t + ", ";
		}
		if(s.length() > 0)
		{
			s = s.substring(0, s.length()-2);
		}
		else
		{
			s = "None";
		}
		return s;
	}