private void setBiorhythmParameters() {
        int birthdayYear, birthdayMonth, birthdayDate;
        int calcYear, calcMonth, calcDate;

        String s;
        StringTokenizer st;

        birthdayYear = 1969;
        birthdayMonth = 12;
        birthdayDate = 12;
        s = getParameter("birthday");
        if (s != null) {
            st = new StringTokenizer(s);
            if (st.countTokens() == 3) {
                try {
                    birthdayYear = Integer.parseInt(st.nextToken());
                    birthdayMonth = Integer.parseInt(st.nextToken());
                    birthdayDate = Integer.parseInt(st.nextToken());
                } catch (NumberFormatException e) {
                }
            }
        }

        Date d = new Date();
        calcYear = d.getYear() + 1900;
        calcMonth = d.getMonth() + 1;
        calcDate = d.getDate();
        s = getParameter("calculateDay");
        if (s != null) {
            st = new StringTokenizer(s);
            if (st.countTokens() == 3) {
                try {
                    calcYear = Integer.parseInt(st.nextToken());
                    calcMonth = Integer.parseInt(st.nextToken());
                    calcDate = Integer.parseInt(st.nextToken());
                } catch (NumberFormatException e) {
                }
            }
        }

        yourBiorhythm = new Biorhythm(birthdayYear, birthdayMonth, birthdayDate,
                                          calcYear, calcMonth, calcDate);
    }