# replace choices ----------------------------------------
      if (preg_match("/(.*)\(c\s*(.*\S)\s*c\)/", $line, $matches)) {
        $field_count++ ;
        $choice = '<div id="answer_'.$field_count.'_box" name="answer_'.$field_count.'_box">' ;
        foreach (preg_split("/\s+/",preg_quote($matches[2])) as $opt) {
          if (substr($opt,0,1) == '&') {
          # right option
          $opt = substr($opt,1) ;
          $answer_table .= ", '".answer_hash($opt)."'" ;
        }
          $choice .= "&nbsp;".$matches[1]
                . '<input id="answer_'.$field_count.'_radio" '
                . 'name="answer_'.$field_count.'_radio" '
            . 'type="radio" style="border:none" value="'.$opt.'" '
              . 'onFocus="return rbutFocused('.$field_count.')" '
              . 'onClick="document.form1.answer_'.$field_count.'.value = this.value ; return rbutChanged('.$field_count.')" '
            . '>' . $opt . "</input><br>\n" ;
        }
        $choice .= '<input type="hidden" '
                 . 'id= "answer_'.$field_count.'"'
                 . 'name= "answer_'.$field_count.'"'
                 . 'value=""></input></div>' ;
             
        $line = preg_replace("/(.*)\(c\s*(.*\S)\s*c\)/"
                 , $choice
                     , $line) ;
      }