anchor.diff:  
   			<a class="navbar-brand " href="<spring:url value="/"/>"> <img
   				alt="Universidad Complutense de Madrid"
  -				src="<spring:url value="/static/img/logoUcm.gif" />"
  -				width="30">
  +				src="<spring:url value="/static/img/logoUcm.gif" />" width="30">
   			</a>
   		</div>
   		<div id="navbar" class="navbar-collapse collapse">
  
positive.code: 				</a>
  					<ul class="dropdown-menu" role="menu">
  						<li><a href="<spring:url value="/avisos"/>" role="button">
  								<span class="glyphicon glyphicon-info-sign"></span> Visor anuncios
  						</a></li>
  						<li class="divider"></li>
  						<li class="dropdown-header">Accesos directos</li>
  						<li><a
  							href="<spring:url value="/avisos/nuevo"></spring:url>">
  								<span class="glyphicon glyphicon-plus"></span> Crear nuevo anuncio
  						</a></li>
  					</ul></li>
  				<li><a href="#">Sección1</a></li>
  				<li><a href="#">Sección2</a></li>
  
  			</ul>
  			<ul class="nav navbar-nav navbar-right">
  				<li><a href="#"><spring:message code="nav.signin"/></a></li>
  				<li><a href="#"><spring:message code="nav.signup"/></a></li>
  				<li class="active">
  				<form action="<spring:url value="/logout" />" method="POST">
  					<sec:csrfInput />
  					<input type="submit" value="<spring:message code="nav.logout"/>" />
  				</form><span class="sr-only">(current)</span></li>
  			</ul>
  		</div>
  		<!--navbarCollapse -->
  
negative.code: <%@ page pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"
  	session="false"%>
  <%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
  <%@ taglib prefix="sec"
  	uri="http://www.springframework.org/security/tags"%>
  <div class="navbar navbar-default navbar-fixed-top "
  	style="z-index: 1000;" role="navigation">
  
  