private void checkEmployeeID() {
		if(employeeField.getText().length() > 0) {
			try {
				int employeeID = Integer.parseInt(employeeField.getText());
				if(employeeID > 0) {
					if(employeeID < ReadFromFile.getNumberFromFile("employee.txt")) {
						Employee [] checkEmployees = ReadFromFile.findAllEmployeeData();
						employeeName.setText(checkEmployees[employeeID-1].getFirstName() + " " + 
										checkEmployees[employeeID-1].getLastName());
					}
					else {
						employeeName.setText("");
					}
				}
				else {
					employeeName.setText("");
				}
			}
			catch(NumberFormatException n) {
				JOptionPane.showMessageDialog(this,
						"Please enter a number.", "Entry Error", JOptionPane.DEFAULT_OPTION);
				employeeName.setText("");
			}
		}
		else {
			employeeName.setText("");
		}
	}