anchor.diff:                      createArmNameRow(0, newIdx, true),
                       createArmNameRow(1, newIdx, true),
                       Builder.node('div', {className:'row submit', id:'arms-' + newIdx + '-group-buttons'}, [
  -                        Builder.node('input', {type:'button', id:'del-arm-button-' + newIdx, value:'Remove last arm'}),
  +                        Builder.node('input', {type:'button', id:'add-arm-button-' + newIdx, value:'Add arm'}),
                           "\n",
  -                        Builder.node('input', {type:'button', id:'add-arm-button-' + newIdx, value:'Add arm'})
  +                        Builder.node('input', {type:'button', id:'del-arm-button-' + newIdx, value:'Remove last arm'})
                       ])
                   ])
               ]);
  
positive.code:         <!-- Scriptaculous requires the display:none to be on the element directly. -->
          <div class="arms-group" id="arms-0-group" style="display: none">
              <div class="row arm-name">
                  <div class="label"><label for="arms-0-0">Arm 1</label></div>
                  <div class="value"><input type="text" id="arms-0-0" name="armNames[0][0]"/></div>
              </div>
              <div class="row arm-name">
                  <div class="label"><label for="arms-0-1">Arm 2</label></div>
                  <div class="value"><input type="text" id="arms-0-1" name="armNames[0][1]"/></div>
              </div>
              <div class="row submit" id="arms-0-group-buttons">
                  <input type="button" id="del-arm-button-0" value="Remove last arm"/>
                  <input type="button" id="add-arm-button-0" value="Add arm"/>
              </div>
          </div>
      </div>
  
negative.code:     </div--%>
      <div class="row" id="form-submit-row">
          <div class="value submit">
              <input type="button" id="add-epoch-button" value="Add epoch"/>
              <input type="button" id="del-epoch-button" value="Remove last epoch"/>
              <input type="submit" class="submit" value="Create"/>
          </div>
  