anchor.diff:  
   <tags:tabForm tab="${tab}" flow="${flow}" willSave="${willSave}" formName="form">
   <jsp:attribute name="singleFields">
  +<c:choose>
  +	<c:when test="${fn:length(command.studySites) == 0}">
  +        <tr>
  +			<td>Choose a study site before adding study personnel</td>
  +		</tr>
  +    </c:when>
  +    <c:otherwise>
  +        <c:set var="selected_site" value="0"/>
  +        <c:if test="${not empty selectedSite}">
  +            <c:set var="selected_site" value="${selectedSite}"/>
  +        </c:if>
   <div>
       <input type="hidden" name="_action" value="">
       <input type="hidden" name="_selected" value="">
  
positive.code:                 <a href="javascript:RowManager.deleteRow(instanceRowInserterProps,PAGE.ROW.INDEX);"><img
                          src="<tags:imageUrl name="checkno.gif"/>" border="0" alt="delete"></a></td>
          </tr>
      </table>
  </div>
  </body>
  
negative.code: </div>
  
  <table border="0" id="table1" cellspacing="10" width="100%">
  
      
  <tr>
  <td valign="top">
  <p id="instructions">
      Choose a study site first
  </p>
  
  <script type="text/javascript">
      var instanceRowInserterProps = {
  