anchor.diff:              <option value="WORDNET">WordNet</option>
               <option value="RANDOMHOUSE">RandomHouse</option>
       <%
  -    } else if ("YOUDAO".equals(WordLinker.dictionary)) {
  +    } else if (Dictionary.YOUDAO==WordLinker.getValidDictionary(request.getParameter("dict"))) {
       %>
               <option value="ICIBA">爱词霸</option>
               <option value="YOUDAO" selected="selected">有道</option>
  
positive.code:             <option value="WORDNET">WordNet</option>
              <option value="RANDOMHOUSE">RandomHouse</option>
      <%
      } else if ("WEBSTER".equals(WordLinker.dictionary)) {
      %>
              <option value="ICIBA">爱词霸</option>
              <option value="YOUDAO">有道</option>
  
negative.code:             <option value="WORDNET">WordNet</option>
              <option value="RANDOMHOUSE">RandomHouse</option>
      <%
      } else if (Dictionary.WIKTIONARY==WordLinker.getValidDictionary(request.getParameter("dict"))) {
      %>
              <option value="ICIBA">爱词霸</option>
              <option value="YOUDAO">有道</option>
  