public static int getIndexOfStu(String IDnum) {
		// String ID = new String(IDnum);

		int counter = 0;

		Student thisStudent = new Student();

		while ((counter < Students.size())) {
			thisStudent = (Student) Students.get(counter);
			if (thisStudent.getID().equals(IDnum))
				return counter;
			counter++;
		}
		return -9;
	}