anchor.diff:                          </c:when>
                           <c:otherwise>
                               <c:forEach var="room" items="${rooms}">
  -                                <td style="text-align:center">
  -                                    <a href="/talk/${talks[date][creneau][room.name].id}.htm<c:if test="${hide}">?hide=true</c:if>">
  -                                        ${talks[date][creneau][room.name].title}
  -                                    </a>
  -                                    <p>${talks[date][creneau][room.name].theme.htmlValue}</p>
  -                                    <p style="text-align:right;">
  -                                        <c:forEach var="speaker" items="${talks[date][creneau][room.name].speakers}">
  -                                            <a href="/speaker/${speaker.id}.htm<c:if test="${hide}">?hide=true</c:if>" imageanchor="1">
  -                                                <img src="${speaker.picture}" title="${speaker.firstName} ${speaker.lastName}" width=30 height=30 /></a>
  -                                        </c:forEach>
  -                                     <p>
  -                                </td>
  +                                <c:if test="${empty talks[date][creneau][room.name]}">
  +                                    <td/>
  +                                </c:if>
  +                                <c:if test="${not empty talks[date][creneau][room.name]}">
  +                                    <td id="${talks[date][creneau][room.name].id}" style="text-align:center"
  +                                            onClick="javascript:changeFavorite(${talks[date][creneau][room.name].id})">
  +                                        <script type='text/javascript' charset='utf-8'>
  +                                            coloriseTalks(${talks[date][creneau][room.name].id});
  +                                        </script>
  +                                        <a href="/talk/${talks[date][creneau][room.name].id}.htm<c:if test="${hide}">?hide=true</c:if>" onClick="javascript:stopPropagation(event)">
  +                                            ${talks[date][creneau][room.name].title}
  +                                        </a>
  +                                        <p>${talks[date][creneau][room.name].theme.htmlValue}</p>
  +                                        <p style="text-align:right;">
  +                                            <c:forEach var="speaker" items="${talks[date][creneau][room.name].speakers}">
  +                                                <a href="/speaker/${speaker.id}.htm<c:if test="${hide}">?hide=true</c:if>" imageanchor="1" onClick="javascript:stopPropagation(event)">
  +                                                    <img src="${speaker.picture}" title="${speaker.firstName} ${speaker.lastName}" width=30 height=30 /></a>
  +                                            </c:forEach>
  +                                         <p>
  +                                    </td>
  +                                </c:if>
                               </c:forEach>
                           </c:otherwise>
                       </c:choose>
  
positive.code: <script type='text/javascript' charset='utf-8'>
           setActive('programme');
  </script>
  
  <c:forEach var="date" items="${dates}">
      <fieldset class="span${fn:length(rooms)*2+2}">
  
negative.code:                     <td>${creneau}</td>
                      <c:choose>
                          <c:when test="${not empty talks[date][creneau][sansRoom]}">
                              <td id="${talks[date][creneau][sansRoom].id}"
                                      colspan="${fn:length(rooms)}" style="text-align:center"
                                      onClick="javascript:changeFavorite(${talks[date][creneau][sansRoom].id})">
                                  <script type='text/javascript' charset='utf-8'>
                                      coloriseTalks(${talks[date][creneau][sansRoom].id});
                                  </script>
                                  <a href="/talk/${talks[date][creneau][sansRoom].id}.htm<c:if test="${hide}">?hide=true</c:if>" onClick="javascript:stopPropagation(event)">
                                      ${talks[date][creneau][sansRoom].title}
                                  </a>
                                  <p>${talks[date][creneau][sansRoom].theme.htmlValue}</p>
                                  <p style="text-align:right;">
                                      <c:forEach var="speaker" items="${talks[date][creneau][sansRoom].speakers}">
                                           <a href="/speaker/${speaker.id}.htm<c:if test="${hide}">?hide=true</c:if>" imageanchor="1" onClick="javascript:stopPropagation(event)">
                                             <img src="${speaker.picture}" title="${speaker.firstName} ${speaker.lastName}" width=30 height=30 /></a>
                                      </c:forEach>
                                  <p>
  