diff --git a/swad_logo.c b/swad_logo.c
new file mode 100644
index 000000000..315aa560f
--- /dev/null
+++ b/swad_logo.c
@@ -0,0 +1,329 @@
+// swad_logo.c: logo of institution, centre or degree
+
+/*
+    SWAD (Shared Workspace At a Distance),
+    is a web platform developed at the University of Granada (Spain),
+    and used to support university teaching.
+
+    This file is part of SWAD core.
+    Copyright (C) 1999-2015 Antonio Caņas Vargas
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General 3 License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*****************************************************************************/
+/*********************************** Headers *********************************/
+/*****************************************************************************/
+
+#include <string.h>		// For string functions
+
+#include "swad_action.h"
+#include "swad_global.h"
+#include "swad_scope.h"
+#include "swad_theme.h"
+
+/*****************************************************************************/
+/****************************** Public constants *****************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Internal constants ****************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/****************************** Internal types *******************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/************** External global variables from others modules ****************/
+/*****************************************************************************/
+
+extern struct Globals Gbl;
+
+/*****************************************************************************/
+/************************* Internal global variables *************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Internal prototypes ***************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/****************************** Draw degree logo *****************************/
+/*****************************************************************************/
+
+void Log_DrawLogo (Sco_Scope_t Scope,long Cod,const char *AltText,
+                   unsigned Size,const char *Style)
+  {
+   const char *Folder;
+   const char *Icon;
+   char PathLogo[PATH_MAX+1];
+   bool LogoExists;
+
+   /***** Set variables depending on scope *****/
+   switch (Scope)
+     {
+      case Sco_SCOPE_INSTITUTION:
+	 Folder = Cfg_FOLDER_INS;
+	 Icon = "ins";
+	 break;
+      case Sco_SCOPE_CENTRE:
+	 Folder = Cfg_FOLDER_CTR;
+	 Icon = "ctr";
+	 break;
+      case Sco_SCOPE_DEGREE:
+	 Folder = Cfg_FOLDER_DEG;
+	 Icon = "deg";
+	 break;
+      default:
+	 return;	// Nothing to do
+     }
+
+   /***** Path to logo *****/
+   if (Cod > 0)
+     {
+      sprintf (PathLogo,"%s/%s/%02u/%u/logo/%u.png",
+	       Cfg_PATH_SWAD_PUBLIC,Folder,
+	       (unsigned) (Cod % 100),
+	       (unsigned) Cod,
+	       (unsigned) Cod);
+      LogoExists = Fil_CheckIfPathExists (PathLogo);
+     }
+   else
+      LogoExists = false;
+
+   /***** Draw logo *****/
+   fprintf (Gbl.F.Out,"<img src=\"");
+   if (LogoExists)
+      fprintf (Gbl.F.Out,"%s/%s/%02u/%u/logo/%u.png",
+	       Cfg_HTTPS_URL_SWAD_PUBLIC,Folder,
+	       (unsigned) (Cod % 100),
+	       (unsigned) Cod,
+	       (unsigned) Cod);
+   else
+      fprintf (Gbl.F.Out,"%s/%s64x64.gif",
+	       Gbl.Prefs.IconsURL,Icon);
+   fprintf (Gbl.F.Out,"\" alt=\"%s\" class=\"ICON%ux%u\"",
+            AltText,Size,Size);
+   if (Style)
+      if (Style[0])
+         fprintf (Gbl.F.Out," style=\"%s\"",Style);
+   fprintf (Gbl.F.Out," />");
+  }
+
+/*****************************************************************************/
+/*************** Put a link to the action used to request  *******************/
+/*************** the logo of institution, centre or degree *******************/
+/*****************************************************************************/
+
+void Log_PutFormToChangeLogo (Sco_Scope_t Scope)
+  {
+   extern const char *The_ClassFormul[The_NUM_THEMES];
+   extern const char *Txt_Change_logo;
+   extern const char *Txt_Upload_logo;
+   Act_Action_t Action;
+   long Cod;
+   const char *Folder;
+   const char *Icon;
+   const char *Msg;
+   char PathLogo[PATH_MAX+1];
+   bool LogoExists;
+
+   /***** Set variables depending on scope *****/
+   switch (Scope)
+     {
+      case Sco_SCOPE_INSTITUTION:
+	 Action = ActReqInsLog;
+	 Cod = Gbl.CurrentIns.Ins.InsCod;
+	 Folder = Cfg_FOLDER_INS;
+	 Icon = "ins";
+	 break;
+      case Sco_SCOPE_CENTRE:
+	 Action = ActReqCtrLog;
+	 Cod = Gbl.CurrentCtr.Ctr.CtrCod;
+	 Folder = Cfg_FOLDER_CTR;
+	 Icon = "ctr";
+	 break;
+      case Sco_SCOPE_DEGREE:
+	 Action = ActReqDegLog;
+	 Cod = Gbl.CurrentDeg.Deg.DegCod;
+	 Folder = Cfg_FOLDER_DEG;
+	 Icon = "deg";
+	 break;
+      default:
+	 return;	// Nothing to do
+     }
+
+   /***** Check if logo exists *****/
+   sprintf (PathLogo,"%s/%s/%02u/%u/logo/%u.png",
+	    Cfg_PATH_SWAD_PUBLIC,Folder,
+	    (unsigned) (Cod % 100),
+	    (unsigned) Cod,
+	    (unsigned) Cod);
+   LogoExists = Fil_CheckIfPathExists (PathLogo);
+
+   /***** Link for changing / uploading the logo *****/
+   Act_FormStart (Action);
+   Msg = LogoExists ? Txt_Change_logo :
+		      Txt_Upload_logo;
+   Act_LinkFormSubmit (Msg,The_ClassFormul[Gbl.Prefs.Theme]);
+   Lay_PutSendIcon (Icon,Msg,Msg);
+   fprintf (Gbl.F.Out,"</form>");
+  }
+
+/*****************************************************************************/
+/**** Show a form for sending a logo of the institution, centre or degree ****/
+/*****************************************************************************/
+
+void Log_RequestLogo (Sco_Scope_t Scope)
+  {
+   extern const char *The_ClassFormul[The_NUM_THEMES];
+   extern const char *Txt_You_can_send_a_file_with_an_image_in_png_format_transparent_background_and_size_X_Y;
+   extern const char *Txt_File_with_the_logo;
+   extern const char *Txt_Upload_logo;
+   Act_Action_t Action;
+
+   /***** Set action depending on scope *****/
+   switch (Scope)
+     {
+      case Sco_SCOPE_INSTITUTION:
+	 Action = ActRecInsLog;
+	 break;
+      case Sco_SCOPE_CENTRE:
+	 Action = ActRecCtrLog;
+	 break;
+      case Sco_SCOPE_DEGREE:
+	 Action = ActRecDegLog;
+	 break;
+      default:
+	 return;	// Nothing to do
+     }
+
+   /***** Write help message *****/
+   sprintf (Gbl.Message,Txt_You_can_send_a_file_with_an_image_in_png_format_transparent_background_and_size_X_Y,
+	    64,64);
+   Lay_ShowAlert (Lay_INFO,Gbl.Message);
+
+   /***** Write a form to send logo *****/
+   Act_FormStart (Action);
+   fprintf (Gbl.F.Out,"<table style=\"margin:0 auto;\">"
+                      "<tr>"
+                      "<td class=\"%s\" style=\"text-align:right;\">"
+                      "%s:"
+                      "</td>"
+                      "<td style=\"text-align:left;\">"
+                      "<input type=\"file\" name=\"%s\" size=\"40\" maxlength=\"100\" value=\"\" />"
+                      "</td>"
+                      "</tr>"
+                      "<tr>"
+                      "<td colspan=\"2\" style=\"text-align:center;\">"
+                      "<input type=\"submit\" value=\"%s\" accept=\"image/jpeg\" />"
+                      "</td>"
+                      "</tr>"
+                      "</table>"
+                      "</form>",
+            The_ClassFormul[Gbl.Prefs.Theme],
+            Txt_File_with_the_logo,
+            Fil_NAME_OF_PARAM_FILENAME_ORG,
+            Txt_Upload_logo);
+  }
+
+/*****************************************************************************/
+/******* Receive the logo of the current institution, centre or degree *******/
+/*****************************************************************************/
+
+void Log_ReceiveLogo (Sco_Scope_t Scope)
+  {
+   extern const char *Txt_The_file_is_not_X;
+   long Cod;
+   const char *Folder;
+   void (*FunctionConfiguration) (void);
+   char Path[PATH_MAX+1];
+   char FileNameLogoSrc[PATH_MAX+1];
+   char MIMEType[Brw_MAX_BYTES_MIME_TYPE+1];
+   char FileNameLogo[PATH_MAX+1];        // Full name (including path and .png) of the destination file
+   bool WrongType = false;
+
+   /***** Set variables depending on scope *****/
+   switch (Scope)
+     {
+      case Sco_SCOPE_INSTITUTION:
+	 Cod = Gbl.CurrentIns.Ins.InsCod;
+	 Folder = Cfg_FOLDER_INS;
+	 FunctionConfiguration = Ins_ShowConfiguration;
+	 break;
+      case Sco_SCOPE_CENTRE:
+	 Cod = Gbl.CurrentCtr.Ctr.CtrCod;
+	 Folder = Cfg_FOLDER_CTR;
+	 FunctionConfiguration = Ctr_ShowConfiguration;
+	 break;
+      case Sco_SCOPE_DEGREE:
+	 Cod = Gbl.CurrentDeg.Deg.DegCod;
+	 Folder = Cfg_FOLDER_DEG;
+	 FunctionConfiguration = Deg_ShowConfiguration;
+	 break;
+      default:
+	 return;	// Nothing to do
+     }
+
+   /***** Creates directories if not exist *****/
+   sprintf (Path,"%s/%s",
+	    Cfg_PATH_SWAD_PUBLIC,Folder);
+   Fil_CreateDirIfNotExists (Path);
+   sprintf (Path,"%s/%s/%02u",
+	    Cfg_PATH_SWAD_PUBLIC,Folder,
+	    (unsigned) (Cod % 100));
+   Fil_CreateDirIfNotExists (Path);
+   sprintf (Path,"%s/%s/%02u/%u",
+	    Cfg_PATH_SWAD_PUBLIC,Folder,
+	    (unsigned) (Cod % 100),
+	    (unsigned) Cod);
+   Fil_CreateDirIfNotExists (Path);
+   sprintf (Path,"%s/%s/%02u/%u/logo",
+	    Cfg_PATH_SWAD_PUBLIC,Folder,
+	    (unsigned) (Cod % 100),
+	    (unsigned) Cod);
+   Fil_CreateDirIfNotExists (Path);
+
+   /***** Copy in disk the file received from stdin (really from Gbl.F.Tmp) *****/
+   Fil_StartReceptionOfFile (FileNameLogoSrc,MIMEType);
+
+   /* Check if the file type is image/jpeg or image/pjpeg or application/octet-stream */
+   if (strcmp (MIMEType,"image/png"))
+      if (strcmp (MIMEType,"image/x-png"))
+         if (strcmp (MIMEType,"application/octet-stream"))
+            if (strcmp (MIMEType,"application/octetstream"))
+               if (strcmp (MIMEType,"application/octet"))
+                  WrongType = true;
+   if (WrongType)
+     {
+      sprintf (Gbl.Message,Txt_The_file_is_not_X,"png");
+      Lay_ShowAlert (Lay_WARNING,Gbl.Message);
+      return;
+     }
+
+   /* End the reception of logo in a temporary file */
+   sprintf (FileNameLogo,"%s/%s/%02u/%u/logo/%u.png",
+	    Cfg_PATH_SWAD_PUBLIC,Folder,
+	    (unsigned) (Cod % 100),
+	    (unsigned) Cod,
+	    (unsigned) Cod);
+   if (!Fil_EndReceptionOfFile (FileNameLogo))
+     {
+      Lay_ShowAlert (Lay_WARNING,"Error uploading file.");
+      return;
+     }
+
+   /***** Show the institution/centre/degree information again *****/
+   FunctionConfiguration ();
+  }
diff --git a/swad_logo.h b/swad_logo.h
new file mode 100644
index 000000000..154e6eb65
--- /dev/null
+++ b/swad_logo.h
@@ -0,0 +1,48 @@
+// swad_logo.h: logo of institution, centre or degree
+
+#ifndef _SWAD_LOG
+#define _SWAD_LOG
+/*
+    SWAD (Shared Workspace At a Distance in Spanish),
+    is a web platform developed at the University of Granada (Spain),
+    and used to support university teaching.
+
+    This file is part of SWAD core.
+    Copyright (C) 1999-2015 Antonio Caņas Vargas
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*****************************************************************************/
+/********************************* Headers ***********************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Public constants ******************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/******************************* Public types ********************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Public prototypes *****************************/
+/*****************************************************************************/
+
+void Log_DrawLogo (Sco_Scope_t Scope,long Cod,const char *AltText,
+                   unsigned Size,const char *Style);
+void Log_PutFormToChangeLogo (Sco_Scope_t Scope);
+void Log_RequestLogo (Sco_Scope_t Scope);
+void Log_ReceiveLogo (Sco_Scope_t Scope);
+
+#endif
diff --git a/swad_tab.c b/swad_tab.c
new file mode 100644
index 000000000..866b20593
--- /dev/null
+++ b/swad_tab.c
@@ -0,0 +1,485 @@
+// swad_tab.c: tabs drawing
+
+/*
+    SWAD (Shared Workspace At a Distance),
+    is a web platform developed at the University of Granada (Spain),
+    and used to support university teaching.
+
+    This file is part of SWAD core.
+    Copyright (C) 1999-2015 Antonio Caņas Vargas
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*****************************************************************************/
+/********************************* Headers ***********************************/
+/*****************************************************************************/
+
+#include "swad_global.h"
+#include "swad_parameter.h"
+#include "swad_tab.h"
+
+/*****************************************************************************/
+/************** External global variables from others modules ****************/
+/*****************************************************************************/
+
+extern struct Globals Gbl;
+extern struct Act_Actions Act_Actions[Act_NUM_ACTIONS];
+
+/*****************************************************************************/
+/****************************** Private constants ****************************/
+/*****************************************************************************/
+
+const char *Tab_TabIcons[Tab_NUM_TABS] =
+  {
+   /* TabUnk */	NULL,
+   /* TabSys */	"sys",
+   /* TabCty */	"cty",
+   /* TabIns */	"ins",
+   /* TabCtr */	"ctr",
+   /* TabDeg */	"deg",
+   /* TabCrs */	"crs",
+   /* TabAss */	"ass",
+   /* TabUsr */	"usr",
+   /* TabMsg */	"msg",
+   /* TabSta */	"sta",
+   /* TabPrf */	"prf",
+  };
+
+/*****************************************************************************/
+/******************************* Private types *******************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Private variables *****************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Private prototypes ****************************/
+/*****************************************************************************/
+
+static void Tab_DrawTabsDeskTop (void);
+static bool Tab_CheckIfICanViewTab (Act_Tab_t Tab);
+
+static void Tab_WriteBreadcrumbHome (void);
+static void Tab_WriteBreadcrumbTab (void);
+static void Tab_WriteBreadcrumbAction (void);
+
+/*****************************************************************************/
+/**************** Draw tabs with the current tab highlighted *****************/
+/*****************************************************************************/
+
+void Tab_DrawTabs (void)
+  {
+   unsigned ColspanCentralPart = 3;
+
+   if (Gbl.Prefs.Layout == Lay_LAYOUT_DESKTOP)
+     {
+      if (Gbl.Prefs.SideCols == Lay_SHOW_BOTH_COLUMNS)	// 11: both side columns visible, left and right
+	 ColspanCentralPart = 1;
+      else if (Gbl.Prefs.SideCols != Lay_HIDE_BOTH_COLUMNS)	// 10 or 01: only one side column visible, left or right
+	 ColspanCentralPart = 2;
+     }
+   fprintf (Gbl.F.Out,"<td colspan=\"%u\" style=\"height:56px;"
+	              " text-align:center; vertical-align:top;"
+		      " background-image:url('%s/head_base_background_1x56.gif');"
+		      " background-repeat:repeat-x;\">"
+		      "<div id=\"tabs_container\">",
+            ColspanCentralPart,Gbl.Prefs.PathTheme);
+   switch (Gbl.Prefs.Layout)
+     {
+      case Lay_LAYOUT_DESKTOP:
+         Tab_DrawTabsDeskTop ();
+         break;
+      case Lay_LAYOUT_MOBILE:
+         Tab_DrawBreadcrumb ();
+         break;
+      default:
+      	 break;
+     }
+   fprintf (Gbl.F.Out,"</div>"
+	              "</td>");
+  }
+
+/*****************************************************************************/
+/**************** Draw tabs with the current tab highlighted *****************/
+/*****************************************************************************/
+
+static void Tab_DrawTabsDeskTop (void)
+  {
+   extern const char *The_ClassTabOn[The_NUM_THEMES];
+   extern const char *The_ClassTabOff[The_NUM_THEMES];
+   extern const char *The_TabOnBgColors[The_NUM_THEMES];
+   extern const char *The_TabOffBgColors[The_NUM_THEMES];
+   extern const char *Txt_TABS_FULL_TXT[Tab_NUM_TABS];
+   extern const char *Txt_TABS_SHORT_TXT[Tab_NUM_TABS];
+   Act_Tab_t NumTab;
+   bool ICanViewTab;
+
+   /***** Table start *****/
+   fprintf (Gbl.F.Out,"<ul style=\"list-style-type:none; padding:0; margin:0;\">");
+
+   /***** Draw the tabs *****/
+   for (NumTab = (Act_Tab_t) 1;
+        NumTab <= (Act_Tab_t) Tab_NUM_TABS - 1;
+        NumTab++)
+     {
+      ICanViewTab = Tab_CheckIfICanViewTab (NumTab);
+
+      /* If current tab is unknown, then activate the first one with access allowed */
+      if (Gbl.CurrentTab == TabUnk)
+	{
+	 Gbl.CurrentTab = NumTab;
+	 Tab_DisableIncompatibleTabs ();
+	}
+
+      if (ICanViewTab || NumTab > TabCrs)	// Don't show the first hidden tabs
+	{
+	 /* Form, icon (at top) and text (at bottom) of the tab */
+	 fprintf (Gbl.F.Out,"<li class=\"%s\" style=\"background-color:%s;\">",
+		  NumTab == Gbl.CurrentTab ? "TAB_ON" :
+					     "TAB_OFF",
+		  NumTab == Gbl.CurrentTab ? The_TabOnBgColors[Gbl.Prefs.Theme] :
+					     The_TabOffBgColors[Gbl.Prefs.Theme]);
+	 if (ICanViewTab)
+	   {
+	    fprintf (Gbl.F.Out,"<div");	// This div must be present even in current tab in order to render properly the tab
+	    if (NumTab != Gbl.CurrentTab)
+	       fprintf (Gbl.F.Out," class=\"ICON_HIGHLIGHT\"");
+	    fprintf (Gbl.F.Out,">");
+	    Act_FormStart (ActMnu);
+	    Par_PutHiddenParamUnsigned ("NxtTab",(unsigned) NumTab);
+	    Act_LinkFormSubmit (Txt_TABS_FULL_TXT[NumTab],
+				NumTab == Gbl.CurrentTab ? The_ClassTabOn[Gbl.Prefs.Theme] :
+							   The_ClassTabOff[Gbl.Prefs.Theme]);
+	    fprintf (Gbl.F.Out,"<img src=\"%s/%s/%s64x64.gif\""
+			       " alt=\"%s\" title=\"%s\""
+			       " class=\"ICON32x32\" style=\"margin:4px;\" />"
+			       "<div>%s</div>"
+			       "</a>"
+			       "</form>",
+		     Gbl.Prefs.PathIconSet,Cfg_ICON_ACTION,
+		     Tab_TabIcons[NumTab],
+		     Txt_TABS_FULL_TXT[NumTab],
+		     Txt_TABS_FULL_TXT[NumTab],
+		     Txt_TABS_SHORT_TXT[NumTab]);
+	   }
+	 else
+	    fprintf (Gbl.F.Out,"<div class=\"ICON_HIDDEN\">"
+			       "<img src=\"%s/%s/%s64x64.gif\""
+			       " alt=\"%s\" title=\"%s\""
+			       " class=\"ICON32x32\" style=\"margin:4px;\" />"
+			       "<div class=\"%s\">%s</div>",
+		     Gbl.Prefs.PathIconSet,Cfg_ICON_ACTION,
+		     Tab_TabIcons[NumTab],
+		     Txt_TABS_FULL_TXT[NumTab],
+		     Txt_TABS_FULL_TXT[NumTab],
+		     The_ClassTabOff[Gbl.Prefs.Theme],
+		     Txt_TABS_SHORT_TXT[NumTab]);
+
+	 fprintf (Gbl.F.Out,"</div>"
+			    "</li>");
+	}
+     }
+
+   /***** End of the table *****/
+   fprintf (Gbl.F.Out,"</ul>");
+  }
+
+/*****************************************************************************/
+/************************ Draw vertical menu with tabs ***********************/
+/*****************************************************************************/
+
+void Tab_DrawTabsMobile (void)
+  {
+   extern const char *The_ClassMenuOff[The_NUM_THEMES];
+   extern const char *Txt_TABS_FULL_TXT[Tab_NUM_TABS];
+   unsigned NumTabVisible;
+   Act_Tab_t NumTab;
+   bool ICanViewTab;
+
+   /***** Table start *****/
+   fprintf (Gbl.F.Out,"<table style=\"width:100%%;\">");
+
+   /***** Loop to write all tabs. Each row holds a tab *****/
+   for (NumTabVisible = 0, NumTab = (Act_Tab_t) 1;
+        NumTab <= (Act_Tab_t) Tab_NUM_TABS - 1;
+        NumTab++)
+     {
+      ICanViewTab = Tab_CheckIfICanViewTab (NumTab);
+
+      if (ICanViewTab || NumTab > TabCrs)	// Don't show the first hidden tabs
+	{
+	 if (NumTabVisible % Cfg_LAYOUT_MOBILE_NUM_COLUMNS == 0)
+	    fprintf (Gbl.F.Out,"<tr>");
+
+	 /* Icon at top and text at bottom */
+	 fprintf (Gbl.F.Out,"<td style=\"width:25%%; text-align:center;"
+	                    " vertical-align:top;\">");
+	 if (ICanViewTab)
+	   {
+	    fprintf (Gbl.F.Out,"<div class=\"ICON_HIGHLIGHT\">");
+	    Act_FormStart (ActMnu);
+	    Par_PutHiddenParamUnsigned ("NxtTab",(unsigned) NumTab);
+	    Act_LinkFormSubmit (Txt_TABS_FULL_TXT[NumTab],The_ClassMenuOff[Gbl.Prefs.Theme]);
+	    fprintf (Gbl.F.Out,"<input type=\"image\" src=\"%s/%s/%s64x64.gif\""
+			       " alt=\"%s\" title=\"%s\" class=\"ICON64x64\""
+			       " style=\"margin:4px;\" />"
+			       "<div>%s</div>"
+			       "</a>"
+			       "</form>"
+			       "</div>",
+		     Gbl.Prefs.PathIconSet,Cfg_ICON_ACTION,
+		     Tab_TabIcons[NumTab],
+		     Txt_TABS_FULL_TXT[NumTab],
+		     Txt_TABS_FULL_TXT[NumTab],
+		     Txt_TABS_FULL_TXT[NumTab]);
+	   }
+	 else
+	    fprintf (Gbl.F.Out,"<div class=\"ICON_HIDDEN\">"
+			       "<img src=\"%s/%s/%s64x64.gif\""
+			       " alt=\"%s\" title=\"%s\""
+			       " class=\"ICON64x64\" style=\"margin:4px;\" />"
+			       "<div class=\"%s\">%s</div>"
+			       "</div>",
+		     Gbl.Prefs.PathIconSet,
+		     Cfg_ICON_ACTION,
+		     Tab_TabIcons[NumTab],
+		     Txt_TABS_FULL_TXT[NumTab],
+		     Txt_TABS_FULL_TXT[NumTab],
+		     The_ClassMenuOff[Gbl.Prefs.Theme],
+		     Txt_TABS_FULL_TXT[NumTab]);
+	 fprintf (Gbl.F.Out,"</td>");
+	 if ((NumTabVisible % Cfg_LAYOUT_MOBILE_NUM_COLUMNS) == (Cfg_LAYOUT_MOBILE_NUM_COLUMNS-1))
+	    fprintf (Gbl.F.Out,"</tr>");
+
+	 NumTabVisible++;
+	}
+     }
+
+   /***** End of the table *****/
+   fprintf (Gbl.F.Out,"</table>");
+  }
+
+/*****************************************************************************/
+/************************* Check if I can view a tab *************************/
+/*****************************************************************************/
+
+static bool Tab_CheckIfICanViewTab (Act_Tab_t Tab)
+  {
+   switch (Tab)
+     {
+      case TabUnk:
+	 return false;
+      case TabSys:
+	 return (Gbl.CurrentCty.Cty.CtyCod <= 0);
+      case TabCty:
+	 return (Gbl.CurrentCty.Cty.CtyCod > 0 &&
+	         Gbl.CurrentIns.Ins.InsCod <= 0);
+      case TabIns:
+	 return (Gbl.CurrentIns.Ins.InsCod > 0 &&
+	         Gbl.CurrentCtr.Ctr.CtrCod <= 0);
+      case TabCtr:
+	 return (Gbl.CurrentCtr.Ctr.CtrCod > 0 &&
+	         Gbl.CurrentDeg.Deg.DegCod <= 0);
+      case TabDeg:
+	 return (Gbl.CurrentDeg.Deg.DegCod > 0 &&
+	         Gbl.CurrentCrs.Crs.CrsCod <= 0);
+      case TabCrs:
+      case TabAss:
+	 return (Gbl.CurrentCrs.Crs.CrsCod > 0);
+      case TabMsg:
+	 return (Gbl.Usrs.Me.Logged ||
+	         Gbl.CurrentCrs.Crs.CrsCod > 0);
+      default:
+	 return true;
+     }
+  }
+
+
+/*****************************************************************************/
+/********************* Draw breadcrumb with tab and action *******************/
+/*****************************************************************************/
+
+void Tab_DrawBreadcrumb (void)
+  {
+   extern const char *The_TabOnBgColors[The_NUM_THEMES];
+   extern const char *The_ClassTabOn[The_NUM_THEMES];
+
+   fprintf (Gbl.F.Out,"<div class=\"TAB_ON\" style=\"background-color:%s;\">",
+	    The_TabOnBgColors[Gbl.Prefs.Theme]);
+
+   /***** Home *****/
+   Tab_WriteBreadcrumbHome ();
+
+   if (Gbl.CurrentAct == ActMnu ||
+       Act_Actions[Act_Actions[Gbl.CurrentAct].SuperAction].IndexInMenu >= 0)
+     {
+      /***** Tab *****/
+      fprintf (Gbl.F.Out,"<span class=\"%s\"> &gt; </span>",
+               The_ClassTabOn[Gbl.Prefs.Theme]);
+      Tab_WriteBreadcrumbTab ();
+
+      if (Act_Actions[Act_Actions[Gbl.CurrentAct].SuperAction].IndexInMenu >= 0)
+        {
+         /***** Menu *****/
+         fprintf (Gbl.F.Out,"<span class=\"%s\"> &gt; </span>",
+                  The_ClassTabOn[Gbl.Prefs.Theme]);
+         Tab_WriteBreadcrumbAction ();
+        }
+     }
+
+   fprintf (Gbl.F.Out,"</div>");
+  }
+
+/*****************************************************************************/
+/************************ Write home in breadcrumb ***************************/
+/*****************************************************************************/
+
+static void Tab_WriteBreadcrumbHome (void)
+  {
+   extern const char *The_ClassTabOn[The_NUM_THEMES];
+   extern const char *Txt_Home_PAGE;
+
+   Act_FormStart (ActHom);
+   Act_LinkFormSubmit (Txt_Home_PAGE,The_ClassTabOn[Gbl.Prefs.Theme]);
+   fprintf (Gbl.F.Out,"%s</a>"
+	              "</form>",
+	    Txt_Home_PAGE);
+  }
+
+/*****************************************************************************/
+/************ Write icon and title associated to the current tab *************/
+/*****************************************************************************/
+
+static void Tab_WriteBreadcrumbTab (void)
+  {
+   extern const char *The_ClassTabOn[The_NUM_THEMES];
+   extern const char *Txt_TABS_FULL_TXT[Tab_NUM_TABS];
+
+   /***** Start form *****/
+   Act_FormStart (ActMnu);
+   Par_PutHiddenParamUnsigned ("NxtTab",(unsigned) Gbl.CurrentTab);
+   Act_LinkFormSubmit (Txt_TABS_FULL_TXT[Gbl.CurrentTab],The_ClassTabOn[Gbl.Prefs.Theme]);
+
+   /***** Title and end of form *****/
+   fprintf (Gbl.F.Out,"%s</a>"
+	              "</form>",
+	    Txt_TABS_FULL_TXT[Gbl.CurrentTab]);
+  }
+
+/*****************************************************************************/
+/***************** Write title associated to the current action **************/
+/*****************************************************************************/
+
+static void Tab_WriteBreadcrumbAction (void)
+  {
+   extern const char *The_ClassTabOn[The_NUM_THEMES];
+   const char *Title = Act_GetTitleAction (Gbl.CurrentAct);
+
+   /***** Start form *****/
+   Act_FormStart (Act_Actions[Gbl.CurrentAct].SuperAction);
+   Act_LinkFormSubmit (Title,The_ClassTabOn[Gbl.Prefs.Theme]);
+
+   /***** Title and end of form *****/
+   fprintf (Gbl.F.Out,"%s</a>"
+	              "</form>",
+	    Title);
+  }
+
+/*****************************************************************************/
+/*************** Set current tab depending on current action *****************/
+/*****************************************************************************/
+
+void Tab_SetCurrentTab (void)
+  {
+   Gbl.CurrentTab = Act_Actions[Gbl.CurrentAct].Tab;
+
+   /***** Change action and tab if country, institution, centre or degree
+          are incompatible with the current tab *****/
+   switch (Gbl.CurrentTab)
+     {
+      case TabCty:
+	 if (Gbl.CurrentCty.Cty.CtyCod <= 0)		// No country selected
+	    Gbl.CurrentAct = ActSeeCty;
+	 break;
+      case TabIns:
+	 if (Gbl.CurrentIns.Ins.InsCod <= 0)		// No institution selected
+	   {
+	    if (Gbl.CurrentCty.Cty.CtyCod > 0)		// Country selected, but no institution selected
+	       Gbl.CurrentAct = ActSeeIns;
+	    else					// No country selected
+	       Gbl.CurrentAct = ActSeeCty;
+	  }
+	break;
+      case TabCtr:
+	 if (Gbl.CurrentCtr.Ctr.CtrCod <= 0)		// No centre selected
+	   {
+	    if (Gbl.CurrentIns.Ins.InsCod > 0)		// Institution selected, but no centre selected
+	       Gbl.CurrentAct = ActSeeCtr;
+	    else if (Gbl.CurrentCty.Cty.CtyCod > 0)	// Country selected, but no institution selected
+	       Gbl.CurrentAct = ActSeeIns;
+	    else					// No country selected
+	       Gbl.CurrentAct = ActSeeCty;
+	   }
+         break;
+      case TabDeg:
+         if (Gbl.CurrentDeg.Deg.DegCod <= 0)		// No degree selected
+	   {
+	    if (Gbl.CurrentCtr.Ctr.CtrCod > 0)		// Centre selected, but no degree selected
+	       Gbl.CurrentAct = ActSeeDeg;
+	    else if (Gbl.CurrentIns.Ins.InsCod > 0)	// Institution selected, but no centre selected
+	       Gbl.CurrentAct = ActSeeCtr;
+	    else if (Gbl.CurrentCty.Cty.CtyCod > 0)	// Country selected, but no institution selected
+	       Gbl.CurrentAct = ActSeeIns;
+	    else					// No country selected
+	       Gbl.CurrentAct = ActSeeCty;
+	   }
+         break;
+      default:
+         break;
+     }
+   Gbl.CurrentTab = Act_Actions[Gbl.CurrentAct].Tab;
+
+   Tab_DisableIncompatibleTabs ();
+  }
+
+/*****************************************************************************/
+/************************** Disable incompatible tabs ************************/
+/*****************************************************************************/
+
+void Tab_DisableIncompatibleTabs (void)
+  {
+   /***** Set country, institution, centre, degree and course depending on the current tab.
+          This will disable tabs incompatible with the current one. *****/
+   switch (Gbl.CurrentTab)
+     {
+      case TabSys:
+	 Gbl.CurrentCty.Cty.CtyCod = -1L;
+	 // no break
+      case TabCty:
+	 Gbl.CurrentIns.Ins.InsCod = -1L;
+	 // no break
+      case TabIns:
+	 Gbl.CurrentCtr.Ctr.CtrCod = -1L;
+	 // no break
+      case TabCtr:
+	 Gbl.CurrentDeg.Deg.DegCod = -1L;
+	 // no break
+      case TabDeg:
+	 Gbl.CurrentCrs.Crs.CrsCod = -1L;
+	 break;
+      default:
+         break;
+     }
+  }
diff --git a/swad_tab.h b/swad_tab.h
new file mode 100644
index 000000000..daba8c2c9
--- /dev/null
+++ b/swad_tab.h
@@ -0,0 +1,51 @@
+// swad_tab.h: tabs drawing
+
+#ifndef _SWAD_TAB
+#define _SWAD_TAB
+/*
+    SWAD (Shared Workspace At a Distance in Spanish),
+    is a web platform developed at the University of Granada (Spain),
+    and used to support university teaching.
+
+    This file is part of SWAD core.
+    Copyright (C) 1999-2015 Antonio Caņas Vargas
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*****************************************************************************/
+/********************************* Headers ***********************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Public constants ******************************/
+/*****************************************************************************/
+
+#define Tab_NUM_TABS	(1+11)
+
+/*****************************************************************************/
+/******************************* Public types ********************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Public prototypes *****************************/
+/*****************************************************************************/
+
+void Tab_DrawTabs (void);
+void Tab_DrawTabsMobile (void);
+void Tab_DrawBreadcrumb (void);
+
+void Tab_SetCurrentTab (void);
+void Tab_DisableIncompatibleTabs (void);
+
+#endif