anchor.diff:  
   <script type="text/javascript">
     BS.DotnetParametersForm.updateElements();
  -  $('buildTypeId').value = window.location.search.substring(1).split('&').grep(/id=buildType:(.*)/).join('').split(':')[1] + ":guestAuth";
  +  $('queryString').value = encodeURIComponent(BS.DotnetParametersForm.getFeedUrlQueryString());
   </script>
positive.code:     </c:set>
      <props:multilineProperty name="${params.nugetPackageSourcesKey}" className="longField" expanded="true"
                               cols="60" rows="3" linkTitle="Sources" note="${note}"/>
      <bs:projectData type="NuGetFeedUrls" sourceFieldId="buildTypeId"
                      targetFieldId="${params.nugetPackageSourcesKey}" popupTitle="Select TeamCity NuGet feeds"/>
      <span class="error" id="error_${params.nugetPackageSourcesKey}"></span>
    </td>
  
negative.code: </l:settingsGroup>
  </tbody>
  
  <button id="queryString" style="display: none"></button>
  
  <tbody>
  
  