diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 4d8e766..7e87d3d 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -5,8 +5,12 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="6b925d8f-3741-4302-aa30-691568703891" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/.idea/dataSources/d62f74f5-c7c9-4ba7-ad88-76b19837ba3a.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/dataSources/d62f74f5-c7c9-4ba7-ad88-76b19837ba3a.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/pagina/categoria.php" beforeDir="false" afterPath="$PROJECT_DIR$/pagina/categoria.php" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pagina/datosdelaobra.pdf" beforeDir="false" afterPath="$PROJECT_DIR$/doc/descargas/datosdelaobra.pdf" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pagina/formatodictamen.pdf" beforeDir="false" afterPath="$PROJECT_DIR$/doc/descargas/formatodictamen.pdf" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pagina/libro.php" beforeDir="false" afterPath="$PROJECT_DIR$/pagina/libro.php" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pagina/lineamiento.html" beforeDir="false" afterPath="$PROJECT_DIR$/pagina/lineamiento.html" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pagina/resultado.php" beforeDir="false" afterPath="$PROJECT_DIR$/pagina/resultado.php" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pagina/sinresultado.php" beforeDir="false" afterPath="$PROJECT_DIR$/pagina/sinresultado.php" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
@@ -44,11 +48,11 @@
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="true">
+      <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/pagina/categoria.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="484">
-              <caret line="74" column="94" selection-start-line="74" selection-start-column="94" selection-end-line="74" selection-end-column="94" />
+            <state relative-caret-position="1533">
+              <caret line="106" column="10" lean-forward="true" selection-start-line="56" selection-start-column="4" selection-end-line="106" selection-end-column="10" />
             </state>
           </provider>
         </entry>
@@ -56,8 +60,17 @@
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/pagina/resultado.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="4026">
-              <caret line="183" column="55" selection-start-line="183" selection-start-column="55" selection-end-line="183" selection-end-column="55" />
+            <state relative-caret-position="301">
+              <caret line="105" column="18" selection-start-line="105" selection-start-column="18" selection-end-line="105" selection-end-column="18" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/pagina/sinresultado.php">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="441">
+              <caret line="118" column="24" selection-start-line="118" selection-start-column="24" selection-end-line="118" selection-end-column="24" />
             </state>
           </provider>
         </entry>
@@ -65,8 +78,8 @@
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/pagina/libro.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="4202">
-              <caret line="191" column="14" selection-start-line="191" selection-start-column="14" selection-end-line="191" selection-end-column="14" />
+            <state relative-caret-position="507">
+              <caret line="72" column="38" selection-start-line="72" selection-start-column="38" selection-end-line="72" selection-end-column="38" />
             </state>
           </provider>
         </entry>
@@ -165,14 +178,14 @@
         <option value="$PROJECT_DIR$/componentes/similares.php" />
         <option value="$PROJECT_DIR$/componentes/header.php" />
         <option value="$PROJECT_DIR$/sql/base.sql" />
-        <option value="$PROJECT_DIR$/pagina/sinresultado.php" />
-        <option value="$PROJECT_DIR$/pagina/resultado.php" />
         <option value="$PROJECT_DIR$/componentes/footer.php" />
         <option value="$PROJECT_DIR$/pagina/lineamiento.html" />
         <option value="$PROJECT_DIR$/sql/conexion.php" />
-        <option value="$PROJECT_DIR$/pagina/libro.php" />
         <option value="$PROJECT_DIR$/funciones/carga.php" />
         <option value="$PROJECT_DIR$/pagina/categoria.php" />
+        <option value="$PROJECT_DIR$/pagina/libro.php" />
+        <option value="$PROJECT_DIR$/pagina/resultado.php" />
+        <option value="$PROJECT_DIR$/pagina/sinresultado.php" />
       </list>
     </option>
   </component>
@@ -204,6 +217,11 @@
               <item name="portal_editorial" type="462c0819:PsiDirectoryNode" />
               <item name="img" type="462c0819:PsiDirectoryNode" />
             </path>
+            <path>
+              <item name="portal_editorial" type="b2602c69:ProjectViewProjectNode" />
+              <item name="portal_editorial" type="462c0819:PsiDirectoryNode" />
+              <item name="pagina" type="462c0819:PsiDirectoryNode" />
+            </path>
             <path>
               <item name="portal_editorial" type="b2602c69:ProjectViewProjectNode" />
               <item name="portal_editorial" type="462c0819:PsiDirectoryNode" />
@@ -227,6 +245,7 @@
   </component>
   <component name="RecentsManager">
     <key name="MoveFile.RECENT_KEYS">
+      <recent name="C:\xampp\htdocs\portal_editorial\doc\descargas" />
       <recent name="C:\xampp\htdocs\portal_editorial\js" />
       <recent name="C:\xampp\htdocs\portal_editorial\funciones" />
       <recent name="C:\xampp\htdocs\portal_editorial\img\header" />
@@ -298,19 +317,19 @@
       <workItem from="1554314706171" duration="25357000" />
       <workItem from="1554410351945" duration="2064000" />
       <workItem from="1554413543234" duration="1896000" />
-      <workItem from="1554415709695" duration="2992000" />
+      <workItem from="1554415709695" duration="3191000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="260444000" />
+    <option name="totallyTimeSpent" value="260643000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="1358" y="-8" width="1296" height="1010" extended-state="6" />
     <editor active="true" />
     <layout>
       <window_info id="Favorites" order="0" side_tool="true" />
-      <window_info content_ui="combo" id="Project" order="1" sideWeight="0.49942988" visible="true" weight="0.17313915" />
+      <window_info active="true" content_ui="combo" id="Project" order="1" sideWeight="0.49942988" visible="true" weight="0.17313915" />
       <window_info id="Structure" order="2" sideWeight="0.5005701" side_tool="true" weight="0.15291262" />
       <window_info anchor="bottom" id="Database Console" order="0" weight="0.59064996" />
       <window_info anchor="bottom" id="Terminal" order="1" weight="0.3279483" />
@@ -489,16 +508,6 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/pagina/sinresultado.php">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="117">
-          <caret line="53" column="31" selection-start-line="53" selection-start-column="31" selection-end-line="53" selection-end-column="31" />
-          <folding>
-            <element signature="n#style#0;n#form#0;n#nav#0;n#div#0;n#div#0;n#body#0;n#html#0;n#!!top" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$PROJECT_DIR$/pagina/lineamiento.html">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="2310">
@@ -520,20 +529,6 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/pagina/resultado.php">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="4026">
-          <caret line="183" column="55" selection-start-line="183" selection-start-column="55" selection-end-line="183" selection-end-column="55" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/pagina/libro.php">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="4202">
-          <caret line="191" column="14" selection-start-line="191" selection-start-column="14" selection-end-line="191" selection-end-column="14" />
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$APPLICATION_CONFIG_DIR$/consoles/db/d62f74f5-c7c9-4ba7-ad88-76b19837ba3a/console.sql">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="574">
@@ -562,10 +557,31 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/pagina/libro.php">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="507">
+          <caret line="72" column="38" selection-start-line="72" selection-start-column="38" selection-end-line="72" selection-end-column="38" />
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/pagina/categoria.php">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="484">
-          <caret line="74" column="94" selection-start-line="74" selection-start-column="94" selection-end-line="74" selection-end-column="94" />
+        <state relative-caret-position="1533">
+          <caret line="106" column="10" lean-forward="true" selection-start-line="56" selection-start-column="4" selection-end-line="106" selection-end-column="10" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/pagina/resultado.php">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="301">
+          <caret line="105" column="18" selection-start-line="105" selection-start-column="18" selection-end-line="105" selection-end-column="18" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/pagina/sinresultado.php">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="441">
+          <caret line="118" column="24" selection-start-line="118" selection-start-column="24" selection-end-line="118" selection-end-column="24" />
         </state>
       </provider>
     </entry>
diff --git a/pagina/datosdelaobra.pdf b/doc/descargas/datosdelaobra.pdf
similarity index 100%
rename from pagina/datosdelaobra.pdf
rename to doc/descargas/datosdelaobra.pdf
diff --git a/pagina/formatodictamen.pdf b/doc/descargas/formatodictamen.pdf
similarity index 100%
rename from pagina/formatodictamen.pdf
rename to doc/descargas/formatodictamen.pdf
diff --git a/pagina/libro.php b/pagina/libro.php
index 0ce5cbc..5349d19 100644
--- a/pagina/libro.php
+++ b/pagina/libro.php
@@ -61,13 +61,14 @@
                                 </a>
                                 <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                                     <!-- <a class="dropdown-item" href="">Ciencias Juridicas</a>-->
+                                    <a class="dropdown-item" href="../pagina/categoria.php?id=Ciencias Socioeconómicas">Ciencias Socioeconómicas</a>
                                     <!-- <a class="dropdown-item" href="">Diseño y Edificación</a>-->
                                     <!-- <a class="dropdown-item" href="">Diulgación Científica</a>-->
                                     <!-- <a class="dropdown-item" href="">Enseñanza de Idiomas</a>-->
-                                    <!-- <a class="dropdown-item" href="">Estudios de Posgrado</a>-->
-                                    <a class="dropdown-item" href="categoria.php?cat=Humanidades">Humanidades</a>
+                                    <a class="dropdown-item" href="../pagina/categoria.php?id=Posgrado">Estudios de Posgrado</a>
+                                    <a class="dropdown-item" href="../pagina/categoria.php?id=Humanidades">Humanidades</a>
                                     <!--  <a class="dropdown-item" href="">Investigación Aplicada y Multidiciplinaria</a> -->
-                                    <a class="dropdown-item" href="categoria.php?cat=Matematicas">Matemáticas e Ingeniería</a>
+                                    <a class="dropdown-item" href="../pagina/categoria.php?id=Matematicas">Matemáticas e Ingeniería</a>
                                     <!--  <a class="dropdown-item" href="">Universidad Abierta y Educación a Dsitancia</a>-->
                                 </div>
                             </li>
diff --git a/pagina/lineamiento.html b/pagina/lineamiento.html
index 96d31d4..f911492 100644
--- a/pagina/lineamiento.html
+++ b/pagina/lineamiento.html
@@ -4679,7 +4679,7 @@
                 <p class="c29"><span class="c1">Solamente en el caso de materiales piloto los &oacute;rganos podr&aacute;n comercializarlos, aplic&aacute;ndoles el costo de recuperaci&oacute;n, conforme a las normas de la Secretar&iacute;a Administrativa. Dichos materiales deber&aacute;n ser revisados previamente por el Presidente del Comit&eacute;, el Secretario Ejecutivo y el Coordinador o Jefe de Divisi&oacute;n que corresponda.</span></p>
                 <p class="c17"><span class="c1"></span></p>
                 <p class="c69 title"><span id="anx5" class="c3">ANEXO 5. FORMATO DE DICTAMEN</span></p>
-                <a href="formatodictamen.pdf" target="_blank">Descargar el Formato</a>
+                <a href="../doc/descargas/formatodictamen.pdf" target="_blank">Descargar el Formato</a>
                 <p class="c17"><span class="c1"></span></p>
                 <p class="c29"><span class="c3">HOJA 1. PORTADA</span></p>
                 <p class="c29 center"><span style="overflow: hidden; display: inline-block; margin: 0.00px 0.00px; border: 0.00px solid #000000; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px); width: 60.93px; height: 56.47px;"><img alt="unam-gif.gif" src="images/image2.gif" style="width: 60.93px; height: 56.47px; margin-left: -0.00px; margin-top: -0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title=""></span><span style="overflow: hidden; display: inline-block; margin: 0.00px 0.00px; border: 0.00px solid #000000; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px); width: 46.73px; height: 48.67px;"><img alt="md_4145391.jpg" src="images/image1.jpg" style="width: 46.73px; height: 48.67px; margin-left: -0.00px; margin-top: -0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title=""></span></p>
@@ -5025,7 +5025,7 @@
                 </ol>
                 <p class="c2 c98"><span class="c1"></span></p>
                 <p class="c69 title"><span id="anx6" class="c3">ANEXO 6. FORMATO REGISTRO DE LA OBRA</span></p>
-        <a href="datosdelaobra.pdf" target="_blank">Descargar el Formato</a>
+        <a href="../doc/descargas/datosdelaobra.pdf" target="_blank">Descargar el Formato</a>
                 <p class="c46 center"><span style="overflow: hidden; display: inline-block; margin: 0.00px 0.00px; border: 0.00px solid #000000; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px); width: 60.93px; height: 56.40px;"><img alt="unam-gif.gif" src="images/image2.gif" style="width: 60.93px; height: 56.40px; margin-left: -0.00px; margin-top: -0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title=""></span><span style="overflow: hidden; display: inline-block; margin: 0.00px 0.00px; border: 0.00px solid #000000; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px); width: 46.73px; height: 48.67px;"><img alt="md_4145391.jpg" src="images/image1.jpg" style="width: 46.73px; height: 48.67px; margin-left: -0.00px; margin-top: -0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title=""></span></p>
                 <p class="c8"><span class="c1">UNIVERSIDAD NACIONAL AUT&Oacute;NOMA DE M&Eacute;XICO</span></p>
                 <p class="c8"><span class="c1">FACULTAD DE ESTUDIOS SUPERIORES ACATL&Aacute;N</span></p>
diff --git a/pagina/resultado.php b/pagina/resultado.php
index 5a3fc09..745fad0 100644
--- a/pagina/resultado.php
+++ b/pagina/resultado.php
@@ -54,57 +54,48 @@ $max = sizeof($data);
             </header>
             <!-- Menú dorado -->
             <div class="menu_pands">
-                <nav class="navbar navbar-expand-lg navbar-light bg-light navbar-toggler toggler-example">
+                <nav class="navbar navbar-expand-lg navbar-light bg-light">
                     <span class="navbar-brand mb-0 h1"><a href="../index.php">Inicio</a></span>
                     <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
-                        <span class="navbar-toggler-icon" ></span><i class="fas fa-bars fa-1x" style="margin-right: 15px;"></i>
+                        <span class="navbar-toggler-icon"></span>
                     </button>
                     <div class="collapse navbar-collapse" id="navbarSupportedContent">
                         <ul class="navbar-nav mr-auto">
                             <li class="nav-item dropdown">
-                                <?php
-                                for($i=0;$i<sizeof($datos);$i=$i+1) {
-                                    if ($datos[$i]['nivel'] == 1) {
-                                        echo "<a class='nav-link dropdown-toggle ' href='#' id='navbarDropdown' role='button' data-toggle='dropdown' aria-haspopup='true' aria-expanded='false'>
-                        {$datos[$i]['nombre']}
-                    </a>";
-                                    }
-                                }
-                                ?>
-
-
+                                <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                                    Libros
+                                </a>
                                 <div class="dropdown-menu" aria-labelledby="navbarDropdown">
-                                    <?php
-                                    //Nivel 2
-                                    for($i=0;$i<sizeof($datos);$i=$i+1) {
-
-                                        if($datos[$i]['nivel'] == 2){
-
-                                            if ($datos[$i]['nombre'] == 'Libros'){
-
-                                                echo "<div class='nav-link dropdown-toggle' href='#' id='navbarDropdown' role='button' data-toggle='dropdown' aria-haspopup='true' aria-expanded='false'>{$datos[$i]['nombre']}</div>";
-                                                echo "<div class='dropdown-menu' aria-labelledby='navbarDropdown'>";
-
-                                                for($i=0;$i<sizeof($datos);$i=$i+1) {
-
-                                                    if($datos[$i]['nivel'] == 3){
-
-                                                        echo "<a class='dropdown-item' href='#'>{$datos[$i]['nombre']}</a>";
-                                                    }
-                                                }
-                                            }
-                                            else echo "<a class='dropdown-item' href='#'>{$datos[$i]['nombre']}</a>";
-                                        }
-                                    }
-
-                                    ?>
-
-
+                                    <!-- <a class="dropdown-item" href="">Ciencias Juridicas</a>-->
+                                    <a class="dropdown-item" href="../pagina/categoria.php?id=Ciencias Socioeconómicas">Ciencias Socioeconómicas</a>
+                                    <!-- <a class="dropdown-item" href="">Diseño y Edificación</a>-->
+                                    <!-- <a class="dropdown-item" href="">Diulgación Científica</a>-->
+                                    <!-- <a class="dropdown-item" href="">Enseñanza de Idiomas</a>-->
+                                    <a class="dropdown-item" href="../pagina/categoria.php?id=Posgrado">Estudios de Posgrado</a>
+                                    <a class="dropdown-item" href="../pagina/categoria.php?id=Humanidades">Humanidades</a>
+                                    <!--  <a class="dropdown-item" href="">Investigación Aplicada y Multidiciplinaria</a> -->
+                                    <a class="dropdown-item" href="../pagina/categoria.php?id=Matematicas">Matemáticas e Ingeniería</a>
+                                    <!--  <a class="dropdown-item" href="">Universidad Abierta y Educación a Dsitancia</a>-->
                                 </div>
                             </li>
-
-
-
+                            <li class="nav-item dropdown">
+                                <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                                    Libros Elecrónicos
+                                </a>
+                                <!--  <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                                     <a class="dropdown-item" href="">Sub elemento 2.1</a>
+                                     <a class="dropdown-item" href="">Sub elemento 2.2</a>
+                                 </div> -->
+                            </li>
+                            <li class="nav-item dropdown">
+                                <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                                    Materiales Gratuitos
+                                </a>
+                                <!-- <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                                    <a class="dropdown-item" href="">Sub elemento 3.1</a>
+                                    <a class="dropdown-item" href="">Sub elemento 3.2</a>
+                                </div> -->
+                            </li>
                         </ul>
                     </div>
                     <form class="form-inline my-2 my-lg-0" action="../pagina/resultado.php">
diff --git a/pagina/sinresultado.php b/pagina/sinresultado.php
index deff577..bafb186 100644
--- a/pagina/sinresultado.php
+++ b/pagina/sinresultado.php
@@ -29,9 +29,51 @@
 
     </header>
     <div class="menu_pands">
-        <nav class="navbar navbar-expand-lg navbar-light bg-light navbar-toggler toggler-example">
+        <nav class="navbar navbar-expand-lg navbar-light bg-light">
             <span class="navbar-brand mb-0 h1"><a href="../index.php">Inicio</a></span>
-            <form style="margin-left: 57%;" class="form-inline my-2 my-lg-0" action="../pagina/resultado.php">
+            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+            <div class="collapse navbar-collapse" id="navbarSupportedContent">
+                <ul class="navbar-nav mr-auto">
+                    <li class="nav-item dropdown">
+                        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                            Libros
+                        </a>
+                        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                            <!-- <a class="dropdown-item" href="">Ciencias Juridicas</a>-->
+                            <a class="dropdown-item" href="../pagina/categoria.php?id=Ciencias Socioeconómicas">Ciencias Socioeconómicas</a>
+                            <!-- <a class="dropdown-item" href="">Diseño y Edificación</a>-->
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+                            <!-- <a class="dropdown-item" href="">Enseñanza de Idiomas</a>-->
+                            <a class="dropdown-item" href="../pagina/categoria.php?id=Posgrado">Estudios de Posgrado</a>
+                            <a class="dropdown-item" href="../pagina/categoria.php?id=Humanidades">Humanidades</a>
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+                        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                            Libros Elecrónicos
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+                        <!--  <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                             <a class="dropdown-item" href="">Sub elemento 2.1</a>
+                             <a class="dropdown-item" href="">Sub elemento 2.2</a>
+                         </div> -->
+                    </li>
+                    <li class="nav-item dropdown">
+                        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                            Materiales Gratuitos
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+                        <!-- <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                            <a class="dropdown-item" href="">Sub elemento 3.1</a>
+                            <a class="dropdown-item" href="">Sub elemento 3.2</a>
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