diff --git a/main/coursecopy/copy_course_session.php b/main/coursecopy/copy_course_session.php
index 7fc8d2bb81..6a6266f0ec 100755
--- a/main/coursecopy/copy_course_session.php
+++ b/main/coursecopy/copy_course_session.php
@@ -1,6 +1,7 @@
 <?php
 /* For licensing terms, see /license.txt */
 
+use ChamiloSession as Session;
 use Chamilo\CourseBundle\Component\CourseCopy\CourseSelectForm;
 use Chamilo\CourseBundle\Component\CourseCopy\CourseBuilder;
 use Chamilo\CourseBundle\Component\CourseCopy\CourseRestorer;
@@ -170,8 +171,8 @@ function search_courses($id_session, $type)
             }
 
             $return .= '</select>';
-            $_SESSION['course_list'] = $temp_course_list;
-            $_SESSION['session_origin'] = $id_session;
+            Session::write('course_list', $temp_course_list);
+            Session::write('session_origin', $id_session);
 
             // Build select for destination sessions where is not included current session from select origin
             if (!empty($id_session)) {
@@ -204,10 +205,6 @@ function search_courses($id_session, $type)
             $xajax_response -> addAssign('ajax_list_courses_origin', 'innerHTML', api_utf8_encode($return));
             $xajax_response -> addAssign('ajax_list_courses_destination', 'innerHTML', api_utf8_encode($select_multiple_empty));
         } else {
-            //Left Select - Destination
-            $list_courses_origin = implode(',', $_SESSION['course_list']);
-            $session_origin = $_SESSION['session_origin'];
-
             // Search courses by id_session where course codes is include en courses list destination
             $sql = "SELECT c.code, c.visual_code, c.title, src.session_id
                     FROM $tbl_course c, $tbl_session_rel_course src
@@ -223,7 +220,8 @@ function search_courses($id_session, $type)
                 $return .= '<option value="'.$course['code'].'" title="'.@htmlspecialchars($course['title'].' ('.$course['visual_code'].')', ENT_QUOTES, api_get_system_encoding()).'">'.$course['title'].' ('.$course['visual_code'].')</option>';
             }
             $return .= '</select>';
-            $_SESSION['course_list_destination'] = $course_list_destination;
+
+            Session::write('course_list_destination', $course_list_destination);
 
             // Send response by ajax
             $xajax_response->addAssign(
diff --git a/main/coursecopy/copy_course_session_selected.php b/main/coursecopy/copy_course_session_selected.php
index 6352aa43af..3fd1c67aae 100644
--- a/main/coursecopy/copy_course_session_selected.php
+++ b/main/coursecopy/copy_course_session_selected.php
@@ -1,6 +1,7 @@
 <?php
 /* For licensing terms, see /license.txt */
 
+use ChamiloSession as Session;
 use Chamilo\CourseBundle\Component\CourseCopy\CourseSelectForm;
 use Chamilo\CourseBundle\Component\CourseCopy\CourseBuilder;
 use Chamilo\CourseBundle\Component\CourseCopy\CourseRestorer;
@@ -216,11 +217,13 @@ function searchCourses($idSession, $type)
                 $course['title'].' ('.$course['visual_code'].')</option>';
         }
         $return .= '</select>';
-        $_SESSION['course_list_destination'] = $course_list_destination;
+        Session::write('course_list_destination', $course_list_destination);
 
         // Send response by ajax
         $xajaxResponse->addAssign(
-            'ajax_list_courses_destination', 'innerHTML', api_utf8_encode($return)
+            'ajax_list_courses_destination',
+            'innerHTML',
+            api_utf8_encode($return)
         );
     }
     return $xajaxResponse;
@@ -278,22 +281,21 @@ Display::display_header($nameTools);
 if ((isset($_POST['action']) && $_POST['action'] == 'course_select_form') ||
     (isset($_POST['copy_option']) && $_POST['copy_option'] == 'full_copy')
 ) {
-
     $destinationCourse = $destinationSession = '';
     $originCourse = api_get_course_id();
     $originSession = api_get_session_id();
 
     if (isset($_POST['action']) && $_POST['action'] == 'course_select_form') {
-
         $destinationCourse = $_POST['destination_course'];
         $destinationSession = $_POST['destination_session'];
         $course = CourseSelectForm::get_posted_course(
-            'copy_course', $originSession, $originCourse
+            'copy_course',
+            $originSession,
+            $originCourse
         );
 
         $cr = new CourseRestorer($course);
         $cr->restore($destinationCourse, $destinationSession);
-
         echo Display::return_message(get_lang('CopyFinished'), 'confirmation');
 
         displayForm();
@@ -329,11 +331,11 @@ if ((isset($_POST['action']) && $_POST['action'] == 'course_select_form') ||
 
                 $cb = new CourseBuilder('', $courseInfo);
                 $course = $cb->build(
-                    $originSession, $courseCode
+                    $originSession,
+                    $courseCode
                 );
                 $cr = new CourseRestorer($course);
                 $cr->restore($courseDestination, $destinationSession);
-
                 echo Display::return_message(get_lang('CopyFinished'), 'confirmation');
             }
 
diff --git a/main/document/create_document.php b/main/document/create_document.php
index 0ef5c225b1..b51c0ca42f 100755
--- a/main/document/create_document.php
+++ b/main/document/create_document.php
@@ -216,7 +216,7 @@ if (!$is_certificate_mode) {
     );
 } else {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('Gradebook'),
     );
 }
diff --git a/main/document/edit_document.php b/main/document/edit_document.php
index c88311c51b..45d6b1f2b5 100755
--- a/main/document/edit_document.php
+++ b/main/document/edit_document.php
@@ -164,7 +164,10 @@ if (!$is_certificate_mode) {
         "name" => get_lang('Documents'),
     );
 } else {
-    $interbreadcrumb[] = array('url' => '../gradebook/'.$_SESSION['gradebook_dest'], 'name' => get_lang('Gradebook'));
+    $interbreadcrumb[] = array(
+        'url' => Category::getUrl(),
+        'name' => get_lang('Gradebook')
+    );
 }
 
 if (empty($document_data['parents'])) {
diff --git a/main/document/edit_draw.php b/main/document/edit_draw.php
index 687951f360..b9c232c561 100755
--- a/main/document/edit_draw.php
+++ b/main/document/edit_draw.php
@@ -103,7 +103,7 @@ if (!$is_certificate_mode) {
     );
 } else {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('Gradebook')
     );
 }
diff --git a/main/document/edit_paint.php b/main/document/edit_paint.php
index 7467bacd0f..7c025ff19e 100755
--- a/main/document/edit_paint.php
+++ b/main/document/edit_paint.php
@@ -99,7 +99,7 @@ if (!$is_certificate_mode) {
     );
 } else {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('Gradebook')
     );
 }
diff --git a/main/exercise/admin.php b/main/exercise/admin.php
index 9d830ae8c8..180635ec3a 100755
--- a/main/exercise/admin.php
+++ b/main/exercise/admin.php
@@ -279,13 +279,9 @@ if ($editQuestion || $modifyQuestion || $newQuestion || $modifyAnswers) {
     $nameTools = get_lang('QuestionManagement');
 }
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/exercise/adminhp.php b/main/exercise/adminhp.php
index b79dcc68ce..ea74e02e2d 100755
--- a/main/exercise/adminhp.php
+++ b/main/exercise/adminhp.php
@@ -37,19 +37,17 @@ if (!$is_allowedToEdit) {
     api_not_allowed(true);
 }
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook'),
     );
 }
 
-$interbreadcrumb[] = array("url" => "exercise.php", "name" => get_lang('Exercises'));
-
+$interbreadcrumb[] = array(
+    "url" => "exercise.php",
+    "name" => get_lang('Exercises')
+);
 $nameTools = get_lang('adminHP');
 
 Display::display_header($nameTools, "Exercise");
diff --git a/main/exercise/exercise.php b/main/exercise/exercise.php
index b5c70bfe9d..c970d9d2a2 100644
--- a/main/exercise/exercise.php
+++ b/main/exercise/exercise.php
@@ -87,17 +87,9 @@ if ($page < 0) {
     $page = 1;
 }
 
-if (!empty($_GET['gradebook']) && $_GET['gradebook'] == 'view') {
-    $_SESSION['gradebook'] = Security::remove_XSS($_GET['gradebook']);
-    $gradebook = $_SESSION['gradebook'];
-} elseif (empty($_GET['gradebook'])) {
-    unset($_SESSION['gradebook']);
-    $gradebook = '';
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/exercise/exercise_admin.php b/main/exercise/exercise_admin.php
index 66dd2a014b..582226f791 100755
--- a/main/exercise/exercise_admin.php
+++ b/main/exercise/exercise_admin.php
@@ -163,14 +163,9 @@ if ($form->validate()) {
     header('Location:admin.php?exerciseId='.$exercise_id.'&'.api_get_cidreq());
     exit;
 } else {
-    // DISPLAY FORM
-    if (isset($_SESSION['gradebook'])) {
-        $gradebook = $_SESSION['gradebook'];
-    }
-
-    if (!empty($gradebook) && $gradebook == 'view') {
+    if (api_is_in_gradebook()) {
         $interbreadcrumb[] = array(
-            'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+            'url' => Category::getUrl(),
             'name' => get_lang('ToolGradebook')
         );
     }
diff --git a/main/exercise/exercise_result.php b/main/exercise/exercise_result.php
index 5014d8bbbc..49ec193323 100755
--- a/main/exercise/exercise_result.php
+++ b/main/exercise/exercise_result.php
@@ -56,13 +56,9 @@ if (empty($objExercise)) {
     api_not_allowed();
 }
 
-$gradebook = '';
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook'),
     );
 }
diff --git a/main/exercise/exercise_show.php b/main/exercise/exercise_show.php
index e075c25d9b..e711334b52 100755
--- a/main/exercise/exercise_show.php
+++ b/main/exercise/exercise_show.php
@@ -135,16 +135,12 @@ if (!$is_allowedToEdit) {
     }
 }
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = Security::remove_XSS($_SESSION['gradebook']);
-}
-
 $allowRecordAudio = api_get_setting('enable_record_audio') === 'true';
 $allowTeacherCommentAudio = api_get_configuration_value('allow_teacher_comment_audio') === true;
 
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/exercise/exercise_submit.php b/main/exercise/exercise_submit.php
index 89a4c83450..4b0c83339b 100755
--- a/main/exercise/exercise_submit.php
+++ b/main/exercise/exercise_submit.php
@@ -775,19 +775,17 @@ if ($question_count != 0) {
     }
 }
 
-if (!empty ($_GET['gradebook']) && $_GET['gradebook'] == 'view') {
-    $_SESSION['gradebook'] = Security::remove_XSS($_GET['gradebook']);
-    $gradebook = $_SESSION['gradebook'];
-} elseif (empty ($_GET['gradebook'])) {
-    unset($_SESSION['gradebook']);
-    $gradebook = '';
-}
-
-if (!empty ($gradebook) && $gradebook == 'view') {
-    $interbreadcrumb[] = array('url' => '../gradebook/'.Security::remove_XSS($_SESSION['gradebook_dest']), 'name' => get_lang('ToolGradebook'));
+if (api_is_in_gradebook()) {
+    $interbreadcrumb[] = array(
+        'url' => Category::getUrl(),
+        'name' => get_lang('ToolGradebook')
+    );
 }
 
-$interbreadcrumb[] = array("url" => "exercise.php?".api_get_cidreq(), "name" => get_lang('Exercises'));
+$interbreadcrumb[] = array(
+    "url" => "exercise.php?".api_get_cidreq(),
+    "name" => get_lang('Exercises')
+);
 $interbreadcrumb[] = array("url" => "#", "name" => $objExercise->selectTitle(true));
 
 if ($origin != 'learnpath') { //so we are not in learnpath tool
diff --git a/main/exercise/hotpotatoes.php b/main/exercise/hotpotatoes.php
index c5338980f1..4b718d6906 100755
--- a/main/exercise/hotpotatoes.php
+++ b/main/exercise/hotpotatoes.php
@@ -19,13 +19,9 @@ if (!api_is_allowed_to_edit(null, true)) {
     api_not_allowed();
 }
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/exercise/overview.php b/main/exercise/overview.php
index 791aaa5064..959e3f3d45 100755
--- a/main/exercise/overview.php
+++ b/main/exercise/overview.php
@@ -36,7 +36,10 @@ $learnpath_item_id = isset($_REQUEST['learnpath_item_id']) ? intval($_REQUEST['l
 $learnpathItemViewId = isset($_REQUEST['learnpath_item_view_id']) ? intval($_REQUEST['learnpath_item_view_id']) : null;
 $origin = api_get_origin();
 
-$interbreadcrumb[] = array("url" => "exercise.php?gradebook=$gradebook", "name" => get_lang('Exercises'));
+$interbreadcrumb[] = array(
+    "url" => "exercise.php?".api_get_path(),
+    "name" => get_lang('Exercises')
+);
 $interbreadcrumb[] = array("url" => "#", "name" => $objExercise->selectTitle(true));
 
 $time_control = false;
@@ -125,7 +128,7 @@ if (isset($exercise_stat_info['exe_id'])) {
 
 // 2. Exercise button
 // Notice we not add there the lp_item_view_id because is not already generated
-$exercise_url = api_get_path(WEB_CODE_PATH).'exercise/exercise_submit.php?'.api_get_cidreq().'&exerciseId='.$objExercise->id.'&origin='.$origin.'&learnpath_id='.$learnpath_id.'&learnpath_item_id='.$learnpath_item_id.'&learnpath_item_view_id='.$learnpathItemViewId.$extra_params;
+$exercise_url = api_get_path(WEB_CODE_PATH).'exercise/exercise_submit.php?'.api_get_cidreq().'&exerciseId='.$objExercise->id.'&learnpath_id='.$learnpath_id.'&learnpath_item_id='.$learnpath_item_id.'&learnpath_item_view_id='.$learnpathItemViewId.$extra_params;
 $exercise_url_button = Display::url(
     $label,
     $exercise_url,
diff --git a/main/exercise/question_pool.php b/main/exercise/question_pool.php
index 84f72d126e..7c3fb0f408 100755
--- a/main/exercise/question_pool.php
+++ b/main/exercise/question_pool.php
@@ -171,12 +171,11 @@ if ($is_allowedToEdit) {
     }
 }
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
-    $interbreadcrumb[] = array('url' => '../gradebook/'.Security::remove_XSS($_SESSION['gradebook_dest']), 'name' => get_lang('ToolGradebook'));
+if (api_is_in_gradebook()) {
+    $interbreadcrumb[] = array(
+        'url' => Category::getUrl(),
+        'name' => get_lang('ToolGradebook')
+    );
 }
 
 // if admin of course
diff --git a/main/forum/editpost.php b/main/forum/editpost.php
index 4d2da12a7a..6d57fb41cb 100755
--- a/main/forum/editpost.php
+++ b/main/forum/editpost.php
@@ -64,14 +64,9 @@ if (!$isEditable) {
     api_not_allowed(true);
 }
 
-/* Header and Breadcrumbs */
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/forum/editthread.php b/main/forum/editthread.php
index 4c2f3bb033..bf4dfa775b 100644
--- a/main/forum/editthread.php
+++ b/main/forum/editthread.php
@@ -34,15 +34,9 @@ $currentForumCategory = get_forumcategory_information($currentForum['forum_categ
 // the variable $forum_settings is declared in forumconfig.inc.php
 $forumSettings = $forum_setting;
 
-/* Breadcrumbs */
-
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = Security::remove_XSS($_SESSION['gradebook']);
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.Security::remove_XSS($_SESSION['gradebook_dest']),
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/forum/forumqualify.php b/main/forum/forumqualify.php
index 8fa8b35855..a0abaa4a06 100755
--- a/main/forum/forumqualify.php
+++ b/main/forum/forumqualify.php
@@ -90,16 +90,9 @@ $currentForumCategory = get_forumcategory_information(
 );
 $groupId = api_get_group_id();
 
-/*
-    Header and Breadcrumbs
-*/
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/forum/forumsearch.php b/main/forum/forumsearch.php
index 639d94fa0c..87ce68d350 100755
--- a/main/forum/forumsearch.php
+++ b/main/forum/forumsearch.php
@@ -39,14 +39,9 @@ $origin = api_get_origin();
 // Name of the tool
 $nameTools = get_lang('ToolForum');
 
-// Breadcrumbs
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/forum/index.php b/main/forum/index.php
index 7cf63ce0bb..732819609a 100755
--- a/main/forum/index.php
+++ b/main/forum/index.php
@@ -52,17 +52,9 @@ $_user = api_get_user_info();
 require_once 'forumconfig.inc.php';
 require_once 'forumfunction.inc.php';
 
-if (!empty($_GET['gradebook']) && $_GET['gradebook'] == 'view') {
-    $_SESSION['gradebook'] = Security::remove_XSS($_GET['gradebook']);
-    $gradebook = $_SESSION['gradebook'];
-} elseif (empty($_GET['gradebook'])) {
-    unset($_SESSION['gradebook']);
-    $gradebook = '';
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook'),
     );
 }
diff --git a/main/forum/newthread.php b/main/forum/newthread.php
index 09c831364d..de5cf35461 100755
--- a/main/forum/newthread.php
+++ b/main/forum/newthread.php
@@ -45,15 +45,9 @@ $origin = api_get_origin();
 $current_forum = get_forum_information($_GET['forum']);
 $current_forum_category = get_forumcategory_information($current_forum['forum_category']);
 
-/* Breadcrumbs */
-
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = Security::remove_XSS($_SESSION['gradebook']);
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.Security::remove_XSS($_SESSION['gradebook_dest']),
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/forum/reply.php b/main/forum/reply.php
index 712817c7e4..f723f33c56 100755
--- a/main/forum/reply.php
+++ b/main/forum/reply.php
@@ -77,23 +77,16 @@ if ($current_forum['forum_of_group'] != 0) {
     }
 }
 
-/* Breadcrumbs */
-
-$gradebook = null;
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = Security::remove_XSS($_SESSION['gradebook']);
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.Security::remove_XSS($_SESSION['gradebook_dest']),
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
 $groupId = api_get_group_id();
 if (!empty($groupId)) {
     $_clean['toolgroup'] = $groupId;
-    $group_properties = GroupManager :: get_group_properties($_clean['toolgroup']);
+    $group_properties = GroupManager::get_group_properties($_clean['toolgroup']);
     $interbreadcrumb[] = array(
         'url' => api_get_path(WEB_CODE_PATH).'group/group.php?'.api_get_cidreq(),
         'name' => get_lang('Groups'),
diff --git a/main/forum/viewforum.php b/main/forum/viewforum.php
index 095dea24ce..2a5170b3ff 100755
--- a/main/forum/viewforum.php
+++ b/main/forum/viewforum.php
@@ -107,14 +107,9 @@ if (!empty($groupId)) {
 $my_search = isset($_GET['search']) ? $_GET['search'] : '';
 $my_action = isset($_GET['action']) ? $_GET['action'] : '';
 
-$gradebook = null;
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/forum/viewforumcategory.php b/main/forum/viewforumcategory.php
index 820246dbae..2e16b372e9 100755
--- a/main/forum/viewforumcategory.php
+++ b/main/forum/viewforumcategory.php
@@ -54,15 +54,9 @@ require_once 'forumfunction.inc.php';
 // Are we in a lp ?
 $origin = api_get_origin();
 
-/* Header and Breadcrumbs */
-$gradebook = null;
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/forum/viewpost.php b/main/forum/viewpost.php
index 96c79168f5..9cf846324f 100755
--- a/main/forum/viewpost.php
+++ b/main/forum/viewpost.php
@@ -41,15 +41,9 @@ $current_forum = get_forum_information($current_thread['forum_id']); // Note: Th
 $current_forum_category = get_forumcategory_information($current_forum['forum_category']);
 $whatsnew_post_info = $_SESSION['whatsnew_post_info'];
 
-/* Header and Breadcrumbs */
-
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/forum/viewthread.php b/main/forum/viewthread.php
index 416c0439ae..a39726d672 100755
--- a/main/forum/viewthread.php
+++ b/main/forum/viewthread.php
@@ -38,16 +38,10 @@ $current_thread = get_thread_information($_GET['forum'], $_GET['thread']);
 $current_forum = get_forum_information($current_thread['forum_id']);
 $current_forum_category = get_forumcategory_information($current_forum['forum_category']);
 $whatsnew_post_info = isset($_SESSION['whatsnew_post_info']) ? $_SESSION['whatsnew_post_info'] : null;
-/* Header and Breadcrumbs */
 
-if (!empty($_GET['gradebook']) && $_GET['gradebook'] == 'view') {
-    $_SESSION['gradebook'] = Security::remove_XSS($_GET['gradebook']);
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/gradebook/gradebook.php b/main/gradebook/gradebook.php
index 04886589dc..ce69d66bb6 100755
--- a/main/gradebook/gradebook.php
+++ b/main/gradebook/gradebook.php
@@ -13,10 +13,10 @@ $_in_course = false;
 //make sure the destination for scripts is index.php instead of gradebook.php
 require_once __DIR__.'/../inc/global.inc.php';
 if (!empty($_GET['course'])) {
-    $_SESSION['gradebook_dest'] = 'index.php';
+    Category::setUrl('index.php');
     $this_section = SECTION_COURSES;
 } else {
-    $_SESSION['gradebook_dest'] = 'gradebook.php';
+    Category::setUrl('gradebook.php');
     $this_section = SECTION_MYGRADEBOOK;
     unset($_GET['course']);
 }
@@ -65,7 +65,7 @@ if (isset($_GET['createallcategories'])) {
             unset($cat);
         }
     }
-    header('Location: '.$_SESSION['gradebook_dest'].'?addallcat=&selectcat=0');
+    header('Location: '.Category::getUrl().'addallcat=&selectcat=0');
     exit;
 }
 
@@ -421,24 +421,27 @@ if (isset($move_form)) {
 if (!isset($_GET['exportpdf']) && !isset($_GET['export_certificate'])) {
     if (isset($_GET['studentoverview'])) {
         $interbreadcrumb[] = array(
-            'url' => $_SESSION['gradebook_dest'].'?selectcat='.$selectcat.'&'.api_get_cidreq(),
+            'url' => Category::getUrl().'selectcat='.$selectcat,
             'name' => get_lang('ToolGradebook')
         );
         Display :: display_header(get_lang('FlatView'));
-    } elseif (isset ($_GET['search'])) {
-        if ($_SESSION['gradebook_dest'] == 'index.php') {
-            $gradebook_dest = Security::remove_XSS($_SESSION['gradebook_dest']).'?'.api_get_cidreq().'&amp;';
-        } else {
-            $gradebook_dest = Security::remove_XSS($_SESSION['gradebook_dest']);
-        }
-
-        $interbreadcrumb[] = array('url' => $gradebook_dest, 'name' => get_lang('Gradebook'));
+    } elseif (isset($_GET['search'])) {
+        $interbreadcrumb[] = array(
+            'url' => Category::getUrl(),
+            'name' => get_lang('Gradebook')
+        );
 
         if ((isset($_GET['selectcat']) && $_GET['selectcat'] > 0)) {
             if (!empty($_GET['course'])) {
-                $interbreadcrumb[] = array('url' => $gradebook_dest.'selectcat='.$selectcat, 'name' => get_lang('Details'));
+                $interbreadcrumb[] = array(
+                    'url' => Category::getUrl().'selectcat='.$selectcat,
+                    'name' => get_lang('Details')
+                );
             } else {
-                $interbreadcrumb[] = array('url' => $_SESSION['gradebook_dest'].'?selectcat=0', 'name' => get_lang('Details'));
+                $interbreadcrumb[] = array(
+                    'url' => Category::getUrl().'selectcat=0',
+                    'name' => get_lang('Details')
+                );
             }
         }
         Display :: display_header('');
diff --git a/main/gradebook/gradebook_add_cat.php b/main/gradebook/gradebook_add_cat.php
index 16e26877bd..3355d36add 100755
--- a/main/gradebook/gradebook_add_cat.php
+++ b/main/gradebook/gradebook_add_cat.php
@@ -89,13 +89,13 @@ if ($form->validate()) {
     }
     $cat->set_visible($visible);
     $result = $cat->add();
-    header('Location: '.Security::remove_XSS($_SESSION['gradebook_dest']).'?addcat=&selectcat='.$cat->get_parent_id().'&'.api_get_cidreq());
+    header('Location: '.Category::getUrl().'addcat=&selectcat='.$cat->get_parent_id());
     exit;
 }
 
 if (!$_in_course) {
     $interbreadcrumb[] = array(
-        'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$get_select_cat.'&'.api_get_cidreq(),
+        'url' => Category::getUrl().'selectcat='.$get_select_cat,
         'name' => get_lang('Gradebook')
     );
 }
diff --git a/main/gradebook/gradebook_add_eval.php b/main/gradebook/gradebook_add_eval.php
index 4acddf3c5e..68999c9cd1 100755
--- a/main/gradebook/gradebook_add_eval.php
+++ b/main/gradebook/gradebook_add_eval.php
@@ -69,7 +69,7 @@ if ($form->validate()) {
             //header('Location: gradebook_add_user.php?selecteval=' . $eval->get_id());
             exit;
         } else {
-            header('Location: '.Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$eval->get_category_id().'&'.api_get_cidreq());
+            header('Location: '.Category::getUrl().'selectcat='.$eval->get_category_id());
             exit;
         }
     } else {
@@ -78,19 +78,19 @@ if ($form->validate()) {
             header('Location: gradebook_add_result.php?selecteval='.$eval->get_id().'&'.api_get_cidreq());
             exit;
         } else {
-            header('Location: '.Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$eval->get_category_id().'&'.api_get_cidreq());
+            header('Location: '.Category::getUrl().'selectcat='.$eval->get_category_id());
             exit;
         }
     }
 }
 
 $interbreadcrumb[] = array(
-    'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$select_cat.'&'.api_get_cidreq(),
+    'url' => Category::getUrl().'selectcat='.$select_cat,
     'name' => get_lang('Gradebook'))
 ;
 $this_section = SECTION_COURSES;
 
-$htmlHeadXtra[] = '<script type="text/javascript">
+$htmlHeadXtra[] = '<script>
 $(document).ready( function() {
     $("#hid_category_id").change(function() {
        $("#hid_category_id option:selected").each(function () {
diff --git a/main/gradebook/gradebook_add_link.php b/main/gradebook/gradebook_add_link.php
index 4b3f89bb16..7b51f0f992 100755
--- a/main/gradebook/gradebook_add_link.php
+++ b/main/gradebook/gradebook_add_link.php
@@ -134,14 +134,14 @@ if (isset($typeSelected) && $typeSelected != '0') {
             header('Location: gradebook_add_result.php?selecteval='.$link->get_ref_id().'&'.api_get_cidreq());
             exit;
         } else {
-            header('Location: '.Security::remove_XSS($_SESSION['gradebook_dest']).'?linkadded=&selectcat='.$selectCat.'&'.api_get_cidreq());
+            header('Location: '.Category::getUrl().'linkadded=&selectcat='.$selectCat);
             exit;
         }
     }
 }
 
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'].'?selectcat='.$selectCat.'&'.api_get_cidreq(),
+    'url' => Category::getUrl().'selectcat='.$selectCat,
     'name' => get_lang('Gradebook')
 );
 $this_section = SECTION_COURSES;
diff --git a/main/gradebook/gradebook_add_link_select_course.php b/main/gradebook/gradebook_add_link_select_course.php
index 72729d32c7..a746248e9a 100755
--- a/main/gradebook/gradebook_add_link_select_course.php
+++ b/main/gradebook/gradebook_add_link_select_course.php
@@ -37,7 +37,7 @@ if ($form->validate()) {
 }
 
 $interbreadcrumb[] = array(
-    'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$selectCat.'&'.api_get_cidreq(),
+    'url' => Category::getUrl().'selectcat='.$selectCat,
     'name' => get_lang('Gradebook')
 );
 Display :: display_header(get_lang('NewCategory'));
diff --git a/main/gradebook/gradebook_add_result.php b/main/gradebook/gradebook_add_result.php
index 4413bd39fb..bf7cedba69 100755
--- a/main/gradebook/gradebook_add_result.php
+++ b/main/gradebook/gradebook_add_result.php
@@ -51,7 +51,7 @@ if ($add_result_form->validate()) {
     exit;
 }
 $interbreadcrumb[] = array(
-    'url' => Security::remove_XSS($_SESSION['gradebook_dest']),
+    'url' => Category::getUrl(),
     'name' => get_lang('Gradebook')
 );
 Display :: display_header(get_lang('AddResult'));
diff --git a/main/gradebook/gradebook_add_user.php b/main/gradebook/gradebook_add_user.php
index 58d3e46125..666abca901 100755
--- a/main/gradebook/gradebook_add_user.php
+++ b/main/gradebook/gradebook_add_user.php
@@ -65,7 +65,7 @@ if (isset($_POST['submit_button'])) {
     }
 }
 
-$interbreadcrumb[] = array('url' => Security::remove_XSS($_SESSION['gradebook_dest']), 'name' => get_lang('Gradebook'));
+$interbreadcrumb[] = array('url' => Category::getUrl(), 'name' => get_lang('Gradebook'));
 $interbreadcrumb[] = array(
 	'url' => 'gradebook_view_result.php?selecteval='.Security::remove_XSS($_GET['selecteval']).'&'.api_get_cidreq(),
 	'name' => get_lang('ViewResult')
diff --git a/main/gradebook/gradebook_display_certificate.php b/main/gradebook/gradebook_display_certificate.php
index 4b34d85c0a..da7c4b50ff 100755
--- a/main/gradebook/gradebook_display_certificate.php
+++ b/main/gradebook/gradebook_display_certificate.php
@@ -160,7 +160,7 @@ switch ($action) {
 }
 
 $interbreadcrumb[] = array(
-    'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?',
+    'url' => Category::getUrl(),
     'name' => get_lang('Gradebook'),
 );
 $interbreadcrumb[] = array('url' => '#', 'name' => get_lang('GradebookListOfStudentsCertificates'));
diff --git a/main/gradebook/gradebook_display_summary.php b/main/gradebook/gradebook_display_summary.php
index 74cf5e7b93..e703d9155f 100644
--- a/main/gradebook/gradebook_display_summary.php
+++ b/main/gradebook/gradebook_display_summary.php
@@ -111,15 +111,18 @@ switch ($action) {
 
 $course_code = api_get_course_id();
 
-$interbreadcrumb[] = array('url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?', 'name' => get_lang('Gradebook'));
-$interbreadcrumb[] = array('url' => '#', 'name' => get_lang('GradebookListOfStudentsReports'));
+$interbreadcrumb[] = array(
+    'url' => Category::getUrl(),
+    'name' => get_lang('Gradebook')
+);
+$interbreadcrumb[] = array(
+    'url' => '#',
+    'name' => get_lang('GradebookListOfStudentsReports')
+);
 
 $this_section = SECTION_COURSES;
-
 Display::display_header('');
-
 $token = Security::get_token();
-
 echo Display::page_header(get_lang('GradebookListOfStudentsReports'));
 
 echo '<div class="btn-group">';
diff --git a/main/gradebook/gradebook_edit_all.php b/main/gradebook/gradebook_edit_all.php
index 94fc1c8023..161ccb0010 100755
--- a/main/gradebook/gradebook_edit_all.php
+++ b/main/gradebook/gradebook_edit_all.php
@@ -227,19 +227,19 @@ if ($form->validate()) {
 if (!isset($_GET['exportpdf']) and !isset($_GET['export_certificate'])) {
     if (isset($_GET['studentoverview'])) {
         $interbreadcrumb[] = array(
-            'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$my_selectcat,
+            'url' => Category::getUrl().'selectcat='.$my_selectcat,
             'name' => get_lang('Gradebook'),
         );
         Display:: display_header(get_lang('FlatView'));
     } elseif (isset($_GET['search'])) {
         $interbreadcrumb[] = array(
-            'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$my_selectcat,
+            'url' => Category::getUrl().'selectcat='.$my_selectcat,
             'name' => get_lang('Gradebook'),
         );
         Display:: display_header(get_lang('SearchResults'));
     } else {
         $interbreadcrumb[] = array(
-            'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat=1',
+            'url' => Category::getUrl().'selectcat=1',
             'name' => get_lang('Gradebook'),
         );
         $interbreadcrumb[] = array(
@@ -251,7 +251,7 @@ if (!isset($_GET['exportpdf']) and !isset($_GET['export_certificate'])) {
 }
 ?>
     <div class="actions">
-        <a href="<?php echo Security::remove_XSS($_SESSION['gradebook_dest']).'?'.$my_api_cidreq ?>&selectcat=<?php echo $my_selectcat ?>">
+        <a href="<?php echo Category::getUrl(); ?>selectcat=<?php echo $my_selectcat ?>">
             <?php echo Display::return_icon(
                 'back.png',
                 get_lang('FolderView'),
diff --git a/main/gradebook/gradebook_edit_cat.php b/main/gradebook/gradebook_edit_cat.php
index 4422896ecd..d6a81c9298 100755
--- a/main/gradebook/gradebook_edit_cat.php
+++ b/main/gradebook/gradebook_edit_cat.php
@@ -80,12 +80,12 @@ if ($form->validate()) {
         $cat->setIsRequirement(false);
     }
     $cat->save();
-    header('Location: '.Security::remove_XSS($_SESSION['gradebook_dest']).'?editcat=&selectcat='.$cat->get_parent_id().'&'.api_get_cidreq());
+    header('Location: '.Category::getUrl().'editcat=&selectcat='.$cat->get_parent_id());
     exit;
 }
 $selectcat = isset($_GET['selectcat']) ? (int) $_GET['selectcat'] : '';
 $interbreadcrumb[] = array(
-    'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$selectcat.'&'.api_get_cidreq(),
+    'url' => Category::getUrl().'selectcat='.$selectcat,
     'name' => get_lang('Gradebook')
 );
 $this_section = SECTION_COURSES;
diff --git a/main/gradebook/gradebook_edit_eval.php b/main/gradebook/gradebook_edit_eval.php
index b6bb6279de..a788a28e5e 100755
--- a/main/gradebook/gradebook_edit_eval.php
+++ b/main/gradebook/gradebook_edit_eval.php
@@ -44,12 +44,12 @@ if ($form->validate()) {
     }
     $eval->set_visible($visible);
     $eval->save();
-    header('Location: '.$_SESSION['gradebook_dest'].'?editeval=&selectcat='.$eval->get_category_id().'&'.api_get_cidreq());
+    header('Location: '.Category::getUrl().'editeval=&selectcat='.$eval->get_category_id());
     exit;
 }
 $selectcat_inter = isset($_GET['selectcat']) ? (int) $_GET['selectcat'] : 0;
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'].'?selectcat='.$selectcat_inter,
+    'url' => Category::getUrl().'selectcat='.$selectcat_inter,
     'name' => get_lang('Gradebook')
 );
 
diff --git a/main/gradebook/gradebook_edit_link.php b/main/gradebook/gradebook_edit_link.php
index a88414e8dd..f45edaf532 100755
--- a/main/gradebook/gradebook_edit_link.php
+++ b/main/gradebook/gradebook_edit_link.php
@@ -104,12 +104,12 @@ if ($form->validate()) {
             'type' => LINK_STUDENTPUBLICATION
         ]);
 
-    header('Location: '.$_SESSION['gradebook_dest'].'?linkedited=&selectcat='.$link->get_category_id().'&'.api_get_cidreq());
+    header('Location: '.Category::getUrl().'linkedited=&selectcat='.$link->get_category_id());
     exit;
 }
 
 $interbreadcrumb[] = array(
-    'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$linkcat,
+    'url' => Category::getUrl().'selectcat='.$linkcat,
     'name' => get_lang('Gradebook')
 );
 
diff --git a/main/gradebook/gradebook_edit_result.php b/main/gradebook/gradebook_edit_result.php
index 32b1399bad..45289aeb42 100755
--- a/main/gradebook/gradebook_edit_result.php
+++ b/main/gradebook/gradebook_edit_result.php
@@ -48,7 +48,7 @@ if ($edit_result_form->validate()) {
 $table = $edit_result_form->toHtml();
 
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'],
+    'url' => Category::getUrl(),
     'name' => get_lang('Gradebook')
 );
 $interbreadcrumb[] = array(
diff --git a/main/gradebook/gradebook_flatview.php b/main/gradebook/gradebook_flatview.php
index 581f1fb93b..b4a1cb241c 100755
--- a/main/gradebook/gradebook_flatview.php
+++ b/main/gradebook/gradebook_flatview.php
@@ -28,7 +28,7 @@ if (isset($_POST['submit']) && isset($_POST['keyword'])) {
 }
 
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'].'?selectcat=1',
+    'url' => Category::getUrl().'selectcat=1',
     'name' => get_lang('ToolGradebook')
 );
 
diff --git a/main/gradebook/gradebook_scoring_system.php b/main/gradebook/gradebook_scoring_system.php
index 6c2d3e263b..5e32a12f49 100755
--- a/main/gradebook/gradebook_scoring_system.php
+++ b/main/gradebook/gradebook_scoring_system.php
@@ -40,7 +40,7 @@ function minItem(item) {
 </script>';
 
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'].'?selectcat=1',
+    'url' => Category::getUrl().'selectcat=1',
     'name' => get_lang('ToolGradebook')
 );
 
diff --git a/main/gradebook/gradebook_showlog_eval.php b/main/gradebook/gradebook_showlog_eval.php
index abdec3d909..9fb2cca9e9 100755
--- a/main/gradebook/gradebook_showlog_eval.php
+++ b/main/gradebook/gradebook_showlog_eval.php
@@ -12,11 +12,11 @@ GradebookUtils::block_students();
 $selectCat = isset($_GET['selectcat']) ? (int) $_GET['selectcat'] : 0;
 
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'].'?',
+    'url' => Category::getUrl(),
     'name' => get_lang('Gradebook')
 );
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'].'?selectcat='.$selectCat,
+    'url' => Category::getUrl().'selectcat='.$selectCat,
     'name' => get_lang('Details')
 );
 $interbreadcrumb[] = array(
diff --git a/main/gradebook/gradebook_showlog_link.php b/main/gradebook/gradebook_showlog_link.php
index 23377cab75..e05f148d9e 100755
--- a/main/gradebook/gradebook_showlog_link.php
+++ b/main/gradebook/gradebook_showlog_link.php
@@ -14,11 +14,11 @@ GradebookUtils::block_students();
 $selectCat = isset($_GET['selectcat']) ? (int) $_GET['selectcat'] : 0;
 
 $interbreadcrumb[] = array(
-    'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?',
+    'url' => Category::getUrl(),
     'name' => get_lang('Gradebook'),
 );
 $interbreadcrumb[] = array(
-    'url' => Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$selectCat,
+    'url' => Category::getUrl().'selectcat='.$selectCat,
     'name' => get_lang('Details')
 );
 $interbreadcrumb[] = array(
diff --git a/main/gradebook/gradebook_statistics.php b/main/gradebook/gradebook_statistics.php
index 66c1b905f8..2c10e14d22 100755
--- a/main/gradebook/gradebook_statistics.php
+++ b/main/gradebook/gradebook_statistics.php
@@ -19,7 +19,9 @@ if ($eval[0]->get_category_id() < 0) {
 }
 
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'].'?selectcat='.$currentcat[0]->get_id(), 'name' => get_lang('ToolGradebook'));
+    'url' => Category::getUrl().'selectcat='.$currentcat[0]->get_id(),
+    'name' => get_lang('ToolGradebook')
+);
 
 if (api_is_allowed_to_edit()) {
     $interbreadcrumb[] = array(
diff --git a/main/gradebook/gradebook_view_result.php b/main/gradebook/gradebook_view_result.php
index 64d7f4d124..45a50f4e06 100755
--- a/main/gradebook/gradebook_view_result.php
+++ b/main/gradebook/gradebook_view_result.php
@@ -19,7 +19,7 @@ if (!$isDrhOfCourse) {
 }
 
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'],
+    'url' => Category::getUrl(),
     'name' => get_lang('Gradebook')
 );
 
@@ -513,7 +513,7 @@ if (isset($_GET['deleteall'])) {
 if (!isset($_GET['export']) && (!isset($_GET['import']))) {
     if (!isset($_GET['selectcat'])) {
         $interbreadcrumb[] = array(
-            'url' => $_SESSION['gradebook_dest'].'?selectcat='.$currentcat[0]->get_id().'&'.api_get_cidreq(),
+            'url' => Category::getUrl().'selectcat='.$currentcat[0]->get_id(),
             'name' => get_lang('Details')
         );
     }
diff --git a/main/gradebook/index.php b/main/gradebook/index.php
index 39b42eaf9d..88ad1b29f1 100755
--- a/main/gradebook/index.php
+++ b/main/gradebook/index.php
@@ -22,7 +22,7 @@ $stud_id = api_get_user_id();
 $session_id = api_get_session_id();
 
 //make sure the destination for scripts is index.php instead of gradebook.php
-$_SESSION['gradebook_dest'] = 'index.php';
+Category::setUrl('index.php');
 
 $this_section = SECTION_COURSES;
 
@@ -150,7 +150,7 @@ if (isset($_GET['createallcategories'])) {
             unset($cat);
         }
     }
-    header('Location: '.$_SESSION['gradebook_dest'].'?addallcat=&selectcat=0');
+    header('Location: '.Category::getUrl().'addallcat=&selectcat=0');
     exit;
 }
 
@@ -575,15 +575,15 @@ $viewTitle = '';
 
 // DISPLAY HEADERS AND MESSAGES
 if (!isset($_GET['exportpdf'])) {
-    if (isset ($_GET['studentoverview'])) {
+    if (isset($_GET['studentoverview'])) {
         $interbreadcrumb[] = array(
-            'url' => $_SESSION['gradebook_dest'].'?selectcat='.$selectCat,
+            'url' => Category::getUrl().'selectcat='.$selectCat,
             'name' => get_lang('ToolGradebook')
         );
         $viewTitle = get_lang('FlatView');
     } elseif (isset($_GET['search'])) {
         $interbreadcrumb[] = array(
-            'url' => $_SESSION['gradebook_dest'].'?selectcat='.$selectCat,
+            'url' => Category::getUrl().'selectcat='.$selectCat,
             'name' => get_lang('ToolGradebook')
         );
         $viewTitle = get_lang('SearchResults');
diff --git a/main/gradebook/lib/be/category.class.php b/main/gradebook/lib/be/category.class.php
index d889d5510e..a5eb919bb3 100755
--- a/main/gradebook/lib/be/category.class.php
+++ b/main/gradebook/lib/be/category.class.php
@@ -2,6 +2,7 @@
 /* For licensing terms, see /license.txt */
 
 use Chamilo\CoreBundle\Entity\GradebookCategory;
+use ChamiloSession as Session;
 
 /**
  * Class Category
@@ -2561,4 +2562,30 @@ class Category implements GradebookItem
         $this->studentList = $list;
     }
 
+    /**
+     * @return string
+     */
+    public static function getUrl()
+    {
+        $url = Session::read('gradebook_dest');
+
+        return $url;
+    }
+
+    /**
+     * Destination is index.php or gradebook.php
+     * @param string $url
+     */
+    public static function setUrl($url)
+    {
+        switch ($url) {
+            case 'gradebook.php':
+                $url = api_get_path(WEB_CODE_PATH).'gradebook/gradebook.php?';
+                break;
+            case 'index.php':
+                $url = api_get_path(WEB_CODE_PATH).'gradebook/index.php?'.api_get_cidreq().'&';
+                break;
+        }
+        Session::write('gradebook_dest', $url);
+    }
 }
diff --git a/main/gradebook/lib/fe/displaygradebook.php b/main/gradebook/lib/fe/displaygradebook.php
index 8b0975b7af..5ba5ed4fa6 100755
--- a/main/gradebook/lib/fe/displaygradebook.php
+++ b/main/gradebook/lib/fe/displaygradebook.php
@@ -20,7 +20,7 @@ class DisplayGradebook
         if (api_is_allowed_to_edit(null, true)) {
             $header = '<div class="actions">';
             if ($page != 'statistics') {
-                $header .= '<a href="'.Security::remove_XSS($_SESSION['gradebook_dest']).'?selectcat='.$selectcat.'&'.api_get_cidreq().'">'.
+                $header .= '<a href="'.Category::getUrl().'selectcat='.$selectcat.'">'.
                     Display::return_icon(('back.png'), get_lang('FolderView'), '', ICON_SIZE_MEDIUM).'</a>';
                 if (($evalobj->get_course_code() != null) && !$evalobj->has_results()) {
                     $header .= '<a href="gradebook_add_result.php?'.api_get_cidreq().'&selectcat='.$selectcat.'&selecteval='.$evalobj->get_id().'">
@@ -110,15 +110,25 @@ class DisplayGradebook
         if ($page != 'statistics') {
             if (api_is_allowed_to_edit(null, true)) {
                 $evalinfo .= '<br /><a href="gradebook_statistics.php?'.api_get_cidreq().'&selecteval='.Security::remove_XSS($_GET['selecteval']).'"> '.
-                    Display::return_icon('statistics.png', get_lang('ViewStatistics'), '', ICON_SIZE_MEDIUM).'</a>';
+                    Display::return_icon(
+                        'statistics.png',
+                        get_lang('ViewStatistics'),
+                        '',
+                        ICON_SIZE_MEDIUM
+                    ).'</a>';
             }
         }
-        $evalinfo .= '</td><td>'.Display::return_icon('tutorial.gif', '', ['style' => 'float:right; position:relative;']).'</td></table>';
+        $evalinfo .= '</td><td>'.
+            Display::return_icon(
+                'tutorial.gif',
+                '',
+                ['style' => 'float:right; position:relative;']
+            )
+            .'</td></table>';
         echo $evalinfo;
         echo $header;
     }
 
-
     /**
      * Displays the header for the flatview page containing filters
      * @param $catobj
@@ -130,7 +140,7 @@ class DisplayGradebook
         $header = '<div class="actions">';
         if ($catobj->get_parent_id() == 0) {
             $select_cat = $catobj->get_id();
-            $url = Security::remove_XSS($_SESSION['gradebook_dest']);
+            $url = Category::getUrl();
         } else {
             $select_cat = $catobj->get_parent_id();
             $url = 'gradebook_flatview.php';
@@ -149,7 +159,12 @@ class DisplayGradebook
         ]);
 
         $header .= Display::url(
-            Display::return_icon('export_csv.png', get_lang('ExportAsCSV'), '', ICON_SIZE_MEDIUM),
+            Display::return_icon(
+                'export_csv.png',
+                get_lang('ExportAsCSV'),
+                '',
+                ICON_SIZE_MEDIUM
+            ),
             $exportCsvUrl
         );
 
@@ -160,7 +175,12 @@ class DisplayGradebook
         ]);
 
         $header .= Display::url(
-            Display::return_icon('export_excel.png', get_lang('ExportAsXLS'), '', ICON_SIZE_MEDIUM),
+            Display::return_icon(
+                'export_excel.png',
+                get_lang('ExportAsXLS'),
+                '',
+                ICON_SIZE_MEDIUM
+            ),
             $exportXlsUrl
         );
 
@@ -171,7 +191,12 @@ class DisplayGradebook
         ]);
 
         $header .= Display::url(
-            Display::return_icon('export_doc.png', get_lang('ExportAsDOC'), '', ICON_SIZE_MEDIUM),
+            Display::return_icon(
+                'export_doc.png',
+                get_lang('ExportAsDOC'),
+                '',
+                ICON_SIZE_MEDIUM
+            ),
             $exportDocUrl
         );
 
@@ -181,7 +206,12 @@ class DisplayGradebook
             ]);
 
         $header .= Display::url(
-            Display::return_icon('printer.png', get_lang('Print'), '', ICON_SIZE_MEDIUM),
+            Display::return_icon(
+                'printer.png',
+                get_lang('Print'),
+                '',
+                ICON_SIZE_MEDIUM
+            ),
             $exportPrintUrl,
             ['target' => '_blank']
         );
@@ -195,7 +225,12 @@ class DisplayGradebook
         ]);
 
         $header .= Display::url(
-            Display::return_icon('pdf.png', get_lang('ExportToPDF'), '', ICON_SIZE_MEDIUM),
+            Display::return_icon(
+                'pdf.png',
+                get_lang('ExportToPDF'),
+                '',
+                ICON_SIZE_MEDIUM
+            ),
             $exportPdfUrl
         );
 
@@ -306,7 +341,13 @@ class DisplayGradebook
             $header .= '<tr>';
             if (!$selectcat == '0') {
                 $header .= '<td><a href="'.api_get_self().'?selectcat='.$catobj->get_parent_id().'">'.
-                    Display::return_icon('back.png', get_lang('BackTo').' '.get_lang('RootCat'), '', ICON_SIZE_MEDIUM).'</a></td>';
+                    Display::return_icon(
+                        'back.png',
+                        get_lang('BackTo').' '.get_lang('RootCat'),
+                        '',
+                        ICON_SIZE_MEDIUM
+                    ).
+                    '</a></td>';
             }
             $header .= '<td>'.get_lang('CurrentCategory').'</td>'.
                     '<td><form name="selector"><select name="selectcat" onchange="document.selector.submit()">';
@@ -347,13 +388,18 @@ class DisplayGradebook
         }
 
         // for course admin & platform admin add item buttons are added to the header
-
         $actionsLeft = '';
+        $actionsRight = '';
         $my_api_cidreq = api_get_cidreq();
         if (api_is_allowed_to_edit(null, true)) {
             if (empty($grade_model_id) || $grade_model_id == -1) {
                 $actionsLeft .= '<a href="gradebook_add_cat.php?'.api_get_cidreq().'&selectcat='.$catobj->get_id().'">'.
-                    Display::return_icon('new_folder.png', get_lang('AddGradebook'), array(), ICON_SIZE_MEDIUM).'</a></td>';
+                    Display::return_icon(
+                        'new_folder.png',
+                        get_lang('AddGradebook'),
+                        array(),
+                        ICON_SIZE_MEDIUM
+                    ).'</a></td>';
             }
             if ($selectcat != '0') {
                 $my_category = $catobj->showAllCategoryInfo($catobj->get_id());
@@ -424,7 +470,6 @@ class DisplayGradebook
                         $actionsRight .= '<a href="gradebook_scoring_system.php?'.$my_api_cidreq.'&selectcat='.$catobj->get_id().'">'.
                             Display::return_icon('ranking.png', get_lang('ScoreEdit'), '', ICON_SIZE_MEDIUM).'</a>';
                     }
-
                 }
             }
         } elseif (isset($_GET['search'])) {
@@ -437,12 +482,21 @@ class DisplayGradebook
         );
 
         if ($isDrhOfCourse) {
-            $$actionsLeft .= '<a href="gradebook_flatview.php?'.$my_api_cidreq.'&selectcat='.$catobj->get_id().'">'.
-                Display::return_icon('stats.png', get_lang('FlatView'), '', ICON_SIZE_MEDIUM).'</a>';
+            $actionsLeft .= '<a href="gradebook_flatview.php?'.$my_api_cidreq.'&selectcat='.$catobj->get_id().'">'.
+                Display::return_icon(
+                    'stats.png',
+                    get_lang('FlatView'),
+                    '',
+                    ICON_SIZE_MEDIUM
+                ).
+                '</a>';
         }
 
         if (api_is_allowed_to_edit(null, true)) {
-            echo $toolbar = Display::toolbarAction('gradebook-actions', array($actionsLeft, $actionsRight));
+            echo $toolbar = Display::toolbarAction(
+                'gradebook-actions',
+                array($actionsLeft, $actionsRight)
+            );
         }
 
         if (api_is_allowed_to_edit(null, true)) {
@@ -486,15 +540,17 @@ class DisplayGradebook
             $catcourse = Category::load($catobj->get_id());
             $scoredisplay = ScoreDisplay::instance();
             $scorecourse = $catcourse[0]->calc_score(api_get_user_id());
-            $scorecourse_display = (isset($scorecourse) ? $scoredisplay->display_score($scorecourse, SCORE_AVERAGE) : get_lang('NoResultsAvailable'));
+            $scorecourse_display = isset($scorecourse) ? $scoredisplay->display_score($scorecourse, SCORE_AVERAGE) : get_lang('NoResultsAvailable');
             $cattotal = Category::load(0);
             $scoretotal = $cattotal[0]->calc_score(api_get_user_id());
-            $scoretotal_display = (isset($scoretotal) ? $scoredisplay->display_score($scoretotal, SCORE_PERCENT) : get_lang('NoResultsAvailable'));
+            $scoretotal_display = isset($scoretotal) ? $scoredisplay->display_score($scoretotal, SCORE_PERCENT) : get_lang('NoResultsAvailable');
             $scoreinfo = get_lang('StatsStudent').' :<b> '.$user['complete_name'].'</b><br />';
             if ((!$catobj->get_id() == '0') && (!isset($_GET['studentoverview'])) && (!isset($_GET['search'])))
                 $scoreinfo .= '<br />'.get_lang('TotalForThisCategory').' : <b>'.$scorecourse_display.'</b>';
             $scoreinfo .= '<br />'.get_lang('Total').' : <b>'.$scoretotal_display.'</b>';
-            Display::addFlash(Display::return_message($scoreinfo, 'normal', false));
+            Display::addFlash(
+                Display::return_message($scoreinfo, 'normal', false)
+            );
         }
         // show navigation tree and buttons?
         $header = '<div class="actions">';
@@ -527,8 +583,16 @@ class DisplayGradebook
         $scoredisplay = ScoreDisplay::instance();
 
         // generating the total score for a course
-        $allevals = $catcourse[0]->get_evaluations($userId, true, api_get_course_id());
-        $alllinks = $catcourse[0]->get_links($userId, true, api_get_course_id());
+        $allevals = $catcourse[0]->get_evaluations(
+            $userId,
+            true,
+            api_get_course_id()
+        );
+        $alllinks = $catcourse[0]->get_links(
+            $userId,
+            true,
+            api_get_course_id()
+        );
         $evals_links = array_merge($allevals, $alllinks);
         $item_value = 0;
         $item_total = 0;
diff --git a/main/gradebook/lib/fe/gradebooktable.class.php b/main/gradebook/lib/fe/gradebooktable.class.php
index 52c00cfe13..95494840be 100755
--- a/main/gradebook/lib/fe/gradebooktable.class.php
+++ b/main/gradebook/lib/fe/gradebooktable.class.php
@@ -985,7 +985,7 @@ class GradebookTable extends SortableTable
         switch ($item->get_item_type()) {
             // category
             case 'C':
-                $prms_uri = '?selectcat='.$item->get_id().'&amp;view='.$view;
+                $prms_uri = '?selectcat='.$item->get_id().'&view='.$view;
                 if (isset($_GET['isStudentView'])) {
                     if (isset($is_student) || (isset($_SESSION['studentview']) && $_SESSION['studentview'] == 'studentview')) {
                         $prms_uri = $prms_uri.'&amp;isStudentView='.Security::remove_XSS($_GET['isStudentView']);
@@ -995,7 +995,7 @@ class GradebookTable extends SortableTable
                 $cat = new Category();
                 $show_message = $cat->show_message_resource_delete($item->get_course_code());
 
-                return '&nbsp;<a href="'.Security::remove_XSS($_SESSION['gradebook_dest']).$prms_uri.'">'
+                return '&nbsp;<a href="'.Category::getUrl().$prms_uri.'">'
                     .$item->get_name()
                     .'</a>'
                     .($item->is_course() ? ' &nbsp;['.$item->get_course_code().']'.$show_message : '');
diff --git a/main/gradebook/lib/gradebook_data_generator.class.php b/main/gradebook/lib/gradebook_data_generator.class.php
index 9a7ddcc1e0..b0df145bcb 100755
--- a/main/gradebook/lib/gradebook_data_generator.class.php
+++ b/main/gradebook/lib/gradebook_data_generator.class.php
@@ -410,7 +410,7 @@ class GradebookDataGenerator
     {
         if (is_a($item, 'Category')) {
             if ($item->is_certificate_available(api_get_user_id())) {
-                $link = '<a href="'.Security::remove_XSS($_SESSION['gradebook_dest']).'?export_certificate=1&cat='.$item->get_id().'&user='.api_get_user_id().'">'.
+                $link = '<a href="'.Category::getUrl().'export_certificate=1&cat='.$item->get_id().'&user='.api_get_user_id().'">'.
                     get_lang('Certificate').'</a>';
                 return $link;
             }
diff --git a/main/gradebook/user_stats.php b/main/gradebook/user_stats.php
index 1965981f6b..de7615871b 100755
--- a/main/gradebook/user_stats.php
+++ b/main/gradebook/user_stats.php
@@ -17,7 +17,7 @@ if (!$isDrhOfCourse) {
     GradebookUtils::block_students();
 }
 $interbreadcrumb[] = array(
-    'url' => $_SESSION['gradebook_dest'],
+    'url' => Category::getUrl(),
     'name' => get_lang('Gradebook')
 );
 
diff --git a/main/lp/learnpath.class.php b/main/lp/learnpath.class.php
index cae99428fa..85e762430f 100755
--- a/main/lp/learnpath.class.php
+++ b/main/lp/learnpath.class.php
@@ -5746,9 +5746,7 @@ class learnpath
             error_log('New LP - In learnpath::overview()', 0);
         }
 
-        $_SESSION['gradebook'] = isset($_GET['gradebook']) ? Security::remove_XSS($_GET['gradebook']) : null;
         $return = '';
-
         $update_audio = isset($_GET['updateaudio']) ? $_GET['updateaudio'] : null;
 
         // we need to start a form when we want to update all the mp3 files
diff --git a/main/lp/lp_add.php b/main/lp/lp_add.php
index 94ea04d1c1..d95981c90a 100755
--- a/main/lp/lp_add.php
+++ b/main/lp/lp_add.php
@@ -54,18 +54,18 @@ if ((!$is_allowed_to_edit) || ($isStudentView)) {
     Course admin section
     - all the functions not available for students - always available in this case (page only shown to admin)
 */
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
 
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
 
-$interbreadcrumb[] = array('url' => 'lp_controller.php?action=list', 'name' => get_lang('LearningPaths'));
+$interbreadcrumb[] = array(
+    'url' => 'lp_controller.php?action=list',
+    'name' => get_lang('LearningPaths')
+);
 
 Display::display_header(get_lang('LearnpathAddLearnpath'), 'Path');
 
diff --git a/main/lp/lp_add_audio.php b/main/lp/lp_add_audio.php
index 9517e98257..e2568072eb 100755
--- a/main/lp/lp_add_audio.php
+++ b/main/lp/lp_add_audio.php
@@ -25,15 +25,10 @@ if ((!$is_allowed_to_edit) || ($isStudentView)) {
     header('location:lp_controller.php?action=view&lp_id='.$learnpath_id);
     exit;
 }
-/* SHOWING THE ADMIN TOOLS */
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/lp/lp_add_item.php b/main/lp/lp_add_item.php
index 8a4a363228..8268bd80dc 100755
--- a/main/lp/lp_add_item.php
+++ b/main/lp/lp_add_item.php
@@ -85,14 +85,9 @@ $(function() {
 });
 </script>";
 
-/* SHOWING THE ADMIN TOOLS */
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/lp/lp_admin_view.php b/main/lp/lp_admin_view.php
index cc2a252d2f..249f929a22 100755
--- a/main/lp/lp_admin_view.php
+++ b/main/lp/lp_admin_view.php
@@ -37,15 +37,9 @@ $sql_query = "SELECT * FROM $tbl_lp WHERE c_id = $course_id AND id = $learnpath_
 $result = Database::query($sql_query);
 $therow = Database::fetch_array($result);
 
-/* SHOWING THE ADMIN TOOLS */
-
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/lp/lp_build.php b/main/lp/lp_build.php
index 67b7f808c0..2aa543417e 100755
--- a/main/lp/lp_build.php
+++ b/main/lp/lp_build.php
@@ -53,19 +53,9 @@ $sql_query = "SELECT * FROM $tbl_lp WHERE c_id = $course_id AND id = $learnpath_
 $result = Database::query($sql_query);
 $therow = Database::fetch_array($result);
 
-/* SHOWING THE ADMIN TOOLS */
-
-if (!empty($_GET['gradebook']) && $_GET['gradebook'] == 'view') {
-    $_SESSION['gradebook'] = Security::remove_XSS($_GET['gradebook']);
-    $gradebook = $_SESSION['gradebook'];
-} elseif (empty($_GET['gradebook'])) {
-    unset($_SESSION['gradebook']);
-    $gradebook = '';
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/lp/lp_content.php b/main/lp/lp_content.php
index d6b8ed228f..1faa71ea2c 100755
--- a/main/lp/lp_content.php
+++ b/main/lp/lp_content.php
@@ -90,13 +90,9 @@ if ($debug > 0) {
 }
 $_SESSION['oLP']->set_previous_item($lp_item_id);
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/lp/lp_edit.php b/main/lp/lp_edit.php
index f40ff654a0..576b0da3b1 100755
--- a/main/lp/lp_edit.php
+++ b/main/lp/lp_edit.php
@@ -15,13 +15,9 @@ $nameTools = get_lang('Doc');
 $this_section = SECTION_COURSES;
 Event::event_access_tool(TOOL_LEARNPATH);
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/lp/lp_edit_item.php b/main/lp/lp_edit_item.php
index c5f58c4b75..de5a5ac6a5 100755
--- a/main/lp/lp_edit_item.php
+++ b/main/lp/lp_edit_item.php
@@ -80,16 +80,9 @@ $therow = Database::fetch_array($result);
     Course admin section
     - all the functions not available for students - always available in this case (page only shown to admin)
 */
-
-/* SHOWING THE ADMIN TOOLS */
-
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/lp/lp_edit_item_prereq.php b/main/lp/lp_edit_item_prereq.php
index 1348880b76..864de49121 100755
--- a/main/lp/lp_edit_item_prereq.php
+++ b/main/lp/lp_edit_item_prereq.php
@@ -37,20 +37,17 @@ $show_learn_path = true;
 $lp = $_SESSION['oLP'];
 $lp_theme_css = $lp->get_theme();
 
-/* SHOWING THE ADMIN TOOLS */
-
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
 
-$interbreadcrumb[] = array('url' => 'lp_controller.php?action=list', 'name' => get_lang('LearningPaths'));
+$interbreadcrumb[] = array(
+    'url' => 'lp_controller.php?action=list',
+    'name' => get_lang('LearningPaths')
+);
 $interbreadcrumb[] = array(
     'url' => api_get_self()."?action=build&lp_id=$learnpath_id",
     'name' => stripslashes($lp->get_name()),
diff --git a/main/lp/lp_list_search.php b/main/lp/lp_list_search.php
index 0bb0b7a968..6428c6dda8 100755
--- a/main/lp/lp_list_search.php
+++ b/main/lp/lp_list_search.php
@@ -17,13 +17,9 @@ require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
 
 Event::event_access_tool(TOOL_SEARCH);
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }
diff --git a/main/lp/lp_move_item.php b/main/lp/lp_move_item.php
index dc41e9a025..215732af43 100755
--- a/main/lp/lp_move_item.php
+++ b/main/lp/lp_move_item.php
@@ -78,15 +78,10 @@ $therow = Database::fetch_array($result);
     Course admin section
     - all the functions not available for students - always available in this case (page only shown to admin)
 */
-/* SHOWING THE ADMIN TOOLS */
 
-if (isset($_SESSION['gradebook'])) {
-    $gradebook = $_SESSION['gradebook'];
-}
-
-if (!empty($gradebook) && $gradebook == 'view') {
+if (api_is_in_gradebook()) {
     $interbreadcrumb[] = array(
-        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
+        'url' => Category::getUrl(),
         'name' => get_lang('ToolGradebook')
     );
 }