1.major changes in function  zxcMakeTextBox of derk_level_2.js ,
  added userDefine (global array)
  define opacity with  --- var normalOpacity = 0.85;
                                      --- var typingOpacity = 0.55;

2.test_with_jquery.html adds library about jquery and autocomplete function

3. in auto_stlye.css,  .text-field is not used.

4. words_source contains one arrary