anchor.diff:                <th>Titre</th>
                 <th>Prix</th>
                 <th>Description</th>
  -              <th>Achetable</th>
                 <th>Date dispo</th>
                 <th>Nom Acheteur</th>
                 <th>Nom Vendeur</th>
                 <th>Nom Joueur</th>
  +              <th>Acheter</th>
                 <th>Modifier</th>
                 <th>Supprimer</th>
               </tr>
  
positive.code:       </div>
      </div>
    </div>
  </layout:authent>
negative.code:                 <td>${ad.title}</td>
                  <td>${ad.price}</td>
                  <td>${ad.description}</td>
                  <td>${ad.availableAt}</td>
                  <td>${ad.buyer.lname}</td>
                  <td>${ad.seller.lname}</td>
                  <td>${ad.footballer.lname}</td>
                  <td><c:choose>
                  <c:when test="${user.id == ad.seller.id}">C'est votre offre</c:when>
                  <c:when test="${!empty ad.buyer}">Cette offre a déjà été vendue</c:when>
                  <c:otherwise>
                  <a href="${pageContext.request.contextPath}/ads/buy?id=${ad.id}" class="waves-effect waves-light btn">Acheter</a></c:choose></td>
                  <td><a href="${pageContext.request.contextPath}/ads/modify?id=${ad.id}" class="waves-effect waves-light btn">Modifier</a></td>
                  <td><a href="${pageContext.request.contextPath}/ads/delete?id=${ad.id}" class="waves-effect waves-light btn">Supprimer</a></td>
                </tr>
  