diff --git a/swad_HTML.c b/swad_HTML.c
index 5975e98ee..d135657a8 100644
--- a/swad_HTML.c
+++ b/swad_HTML.c
@@ -827,7 +827,7 @@ void HTM_INPUT_TEXT (const char *Name,unsigned MaxLength,const char *Value,bool
      }
 
    if (SubmitOnChange)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
 	       Gbl.Form.Id);
 
    fprintf (Gbl.F.Out," />");
@@ -899,7 +899,7 @@ void HTM_INPUT_TEL (const char *Name,const char *Value,bool SubmitOnChange,
      }
 
    if (SubmitOnChange)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
 	       Gbl.Form.Id);
 
    fprintf (Gbl.F.Out," />");
@@ -971,7 +971,7 @@ void HTM_INPUT_URL (const char *Name,const char *Value,bool SubmitOnChange,
      }
 
    if (SubmitOnChange)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
 	       Gbl.Form.Id);
 
    fprintf (Gbl.F.Out," />");
@@ -982,7 +982,7 @@ void HTM_INPUT_FILE (const char *Accept,bool SubmitOnChange)
    fprintf (Gbl.F.Out,"<input type=\"file\" name=\"%s\" accept=\"%s\"",
 	    Fil_NAME_OF_PARAM_FILENAME_ORG,Accept);
    if (SubmitOnChange)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
 	       Gbl.Form.Id);
    fprintf (Gbl.F.Out," />");
   }
@@ -1059,7 +1059,7 @@ void HTM_INPUT_RADIO (const char *Name,bool SubmitOnClick,
      }
 
    if (SubmitOnClick)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
 	       Gbl.Form.Id);
    fprintf (Gbl.F.Out," />");
   }
@@ -1094,7 +1094,7 @@ void HTM_INPUT_CHECKBOX (const char *Name,bool SubmitOnChange,
      }
 
    if (SubmitOnChange)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
 	       Gbl.Form.Id);
    fprintf (Gbl.F.Out," />");
   }
diff --git a/swad_centre.c b/swad_centre.c
index 4c808a11d..9ce1a4555 100644
--- a/swad_centre.c
+++ b/swad_centre.c
@@ -387,7 +387,7 @@ static void Ctr_Configuration (bool PrintView)
 	 HTM_DIV_Begin ("class=\"CM\"");
 	 Frm_StartForm (ActChgCtrPhoAtt);
 	 HTM_TEXTAREA_Begin ("id=\"AttributionArea\" name=\"Attribution\" rows=\"2\""
-			     " onchange=\"document.getElementById('%s').submit();\"",
+			     " onchange=\"document.getElementById('%s').submit();return false;\"",
 		             Gbl.Form.Id);
 	 if (PhotoAttribution)
 	    fprintf (Gbl.F.Out,"%s",PhotoAttribution);
@@ -430,7 +430,7 @@ static void Ctr_Configuration (bool PrintView)
       Frm_StartForm (ActChgCtrInsCfg);
       fprintf (Gbl.F.Out,"<select id=\"OthInsCod\" name=\"OthInsCod\""
 			 " class=\"INPUT_SHORT_NAME\""
-			 " onchange=\"document.getElementById('%s').submit();\">",
+			 " onchange=\"document.getElementById('%s').submit();return false;\">",
 	       Gbl.Form.Id);
       for (NumIns = 0;
 	   NumIns < Gbl.Hierarchy.Cty.Inss.Num;
@@ -526,7 +526,7 @@ static void Ctr_Configuration (bool PrintView)
       /* Put form to select place */
       Frm_StartForm (ActChgCtrPlcCfg);
       fprintf (Gbl.F.Out,"<select name=\"PlcCod\" class=\"INPUT_SHORT_NAME\""
-			 " onchange=\"document.getElementById('%s').submit();\">",
+			 " onchange=\"document.getElementById('%s').submit();return false;\">",
 	       Gbl.Form.Id);
       fprintf (Gbl.F.Out,"<option value=\"0\"");
       if (Gbl.Hierarchy.Ctr.PlcCod == 0)
@@ -1402,7 +1402,7 @@ void Ctr_WriteSelectorOfCentre (void)
    Frm_StartFormGoTo (ActSeeDeg);
    fprintf (Gbl.F.Out,"<select id=\"ctr\" name=\"ctr\" class=\"HIE_SEL\"");
    if (Gbl.Hierarchy.Ins.InsCod > 0)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
                Gbl.Form.Id);
    else
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
@@ -1517,7 +1517,7 @@ static void Ctr_ListCentresForEdition (void)
 	 Frm_StartForm (ActChgCtrPlc);
 	 Ctr_PutParamOtherCtrCod (Ctr->CtrCod);
 	 fprintf (Gbl.F.Out,"<select name=\"PlcCod\" class=\"PLC_SEL\""
-			    " onchange=\"document.getElementById('%s').submit();\">",
+			    " onchange=\"document.getElementById('%s').submit();return false;\">",
 		  Gbl.Form.Id);
 	 fprintf (Gbl.F.Out,"<option value=\"0\"");
 	 if (Ctr->PlcCod == 0)
@@ -1624,7 +1624,7 @@ static void Ctr_ListCentresForEdition (void)
 	 Frm_StartForm (ActChgCtrSta);
 	 Ctr_PutParamOtherCtrCod (Ctr->CtrCod);
 	 fprintf (Gbl.F.Out,"<select name=\"Status\" class=\"INPUT_STATUS\""
-			    " onchange=\"document.getElementById('%s').submit();\">"
+			    " onchange=\"document.getElementById('%s').submit();return false;\">"
 			    "<option value=\"%u\" selected=\"selected\">%s</option>"
 			    "<option value=\"%u\">%s</option>"
 			    "</select>",
diff --git a/swad_changelog.h b/swad_changelog.h
index 85200c8da..0c8a7b275 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -490,7 +490,7 @@ enscript -2 --landscape --color --file-align=2 --highlight --line-numbers -o - *
 En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
-#define Log_PLATFORM_VERSION	"SWAD 19.51.19 (2019-11-04)"
+#define Log_PLATFORM_VERSION	"SWAD 19.51.20 (2019-11-04)"
 #define CSS_FILE		"swad19.47.css"
 #define JS_FILE			"swad19.39.js"
 /*
@@ -498,6 +498,7 @@ ps2pdf source.ps destination.pdf
 // TODO: Impedir la creación y edición de proyectos si no son editables.
 // TODO: Importante: filtrar proyectos por usuarios (igual que en trabajos o en asistencia)
 
+	Version 19.51.20: Nov 04, 2019	Fixed bug expanding/contracting folders in Microsoft Edge, reported by Mancia Anguita López. (? lines)
 	Version 19.51.19: Nov 04, 2019	Code refactoring in HTML inputs. (245904 lines)
 	Version 19.51.18: Nov 04, 2019	Code refactoring in HTML inputs. (245912 lines)
 	Version 19.51.17: Nov 04, 2019	Code refactoring in HTML inputs. (245887 lines)
diff --git a/swad_country.c b/swad_country.c
index 4d71c315f..90e731136 100644
--- a/swad_country.c
+++ b/swad_country.c
@@ -297,7 +297,7 @@ static void Cty_Configuration (bool PrintView)
 	 HTM_DIV_Begin ("class=\"CM\"");
 	 Frm_StartForm (ActChgCtyMapAtt);
 	 HTM_TEXTAREA_Begin ("name=\"Attribution\" cols=\"50\" rows=\"2\""
-			     " onchange=\"document.getElementById('%s').submit();\"",
+			     " onchange=\"document.getElementById('%s').submit();return false;\"",
 		             Gbl.Form.Id);
 	 if (MapAttribution)
 	    fprintf (Gbl.F.Out,"%s",MapAttribution);
@@ -1233,7 +1233,7 @@ void Cty_WriteSelectorOfCountry (void)
    /***** Begin form *****/
    Frm_StartFormGoTo (ActSeeIns);
    fprintf (Gbl.F.Out,"<select id=\"cty\" name=\"cty\" class=\"HIE_SEL\""
-                      " onchange=\"document.getElementById('%s').submit();\">"
+                      " onchange=\"document.getElementById('%s').submit();return false;\">"
                       "<option value=\"\"",
 	    Gbl.Form.Id);
    if (Gbl.Hierarchy.Cty.CtyCod < 0)
diff --git a/swad_course.c b/swad_course.c
index 4cdff9024..2ebaf7c40 100644
--- a/swad_course.c
+++ b/swad_course.c
@@ -255,7 +255,7 @@ static void Crs_Configuration (bool PrintView)
       Frm_StartForm (ActChgCrsDegCfg);
       fprintf (Gbl.F.Out,"<select id=\"OthDegCod\" name=\"OthDegCod\""
 			 " class=\"INPUT_SHORT_NAME\""
-			 " onchange=\"document.getElementById('%s').submit();\">",
+			 " onchange=\"document.getElementById('%s').submit();return false;\">",
 	       Gbl.Form.Id);
       for (NumDeg = 0;
 	   NumDeg < Gbl.Hierarchy.Ctr.Degs.Num;
@@ -345,7 +345,7 @@ static void Crs_Configuration (bool PrintView)
      {
       Frm_StartForm (ActChgCrsYeaCfg);
       fprintf (Gbl.F.Out,"<select id=\"OthCrsYear\" name=\"OthCrsYear\""
-	                 " onchange=\"document.getElementById('%s').submit();\">",
+	                 " onchange=\"document.getElementById('%s').submit();return false;\">",
                Gbl.Form.Id);
       for (Year = 0;
 	   Year <= Deg_MAX_YEARS_PER_DEGREE;
@@ -888,7 +888,7 @@ void Crs_WriteSelectorOfCourse (void)
    Frm_StartFormGoTo (ActSeeCrsInf);
    fprintf (Gbl.F.Out,"<select id=\"crs\" name=\"crs\" class=\"HIE_SEL\"");
    if (Gbl.Hierarchy.Deg.DegCod > 0)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
                Gbl.Form.Id);
    else
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
@@ -1060,7 +1060,7 @@ void Crs_WriteSelectorMyCoursesInBreadcrumb (void)
 
    /***** Start selector of courses *****/
    fprintf (Gbl.F.Out,"<select id=\"my_courses\" name=\"crs\""
-                      " onchange=\"document.getElementById('%s').submit();\">",
+                      " onchange=\"document.getElementById('%s').submit();return false;\">",
             Gbl.Form.Id);
 
    /***** Write an option when no course selected *****/
@@ -1484,7 +1484,7 @@ static void Crs_ListCoursesOfAYearForEdition (unsigned Year)
 	    Frm_StartForm (ActChgCrsYea);
 	    Crs_PutParamOtherCrsCod (Crs->CrsCod);
 	    fprintf (Gbl.F.Out,"<select name=\"OthCrsYear\" class=\"HIE_SEL_NARROW\""
-			       " onchange=\"document.getElementById('%s').submit();\">",
+			       " onchange=\"document.getElementById('%s').submit();return false;\">",
 		     Gbl.Form.Id);
 	    for (YearAux = 0;
 		 YearAux <= Deg_MAX_YEARS_PER_DEGREE;
@@ -1556,7 +1556,7 @@ static void Crs_ListCoursesOfAYearForEdition (unsigned Year)
 	    Frm_StartForm (ActChgCrsSta);
 	    Crs_PutParamOtherCrsCod (Crs->CrsCod);
 	    fprintf (Gbl.F.Out,"<select name=\"Status\" class=\"INPUT_STATUS\""
-			       " onchange=\"document.getElementById('%s').submit();\">"
+			       " onchange=\"document.getElementById('%s').submit();return false;\">"
 			       "<option value=\"%u\" selected=\"selected\">%s</option>"
 			       "<option value=\"%u\">%s</option>"
 			       "</select>",
diff --git a/swad_date.c b/swad_date.c
index 3f22d430a..2fd84fc69 100644
--- a/swad_date.c
+++ b/swad_date.c
@@ -567,7 +567,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
                       "setUTCFromLocalDateTimeForm('%s');",
 	    Id,ParamName,Id,Id);
    if (SubmitFormOnChange)
-      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
+      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();return false;",
                Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Year = FirstYear;
@@ -586,7 +586,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
                       "setUTCFromLocalDateTimeForm('%s');",
 	    Id,ParamName,Id,Id);
    if (SubmitFormOnChange)
-      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
+      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();return false;",
                Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Month = 1;
@@ -603,7 +603,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
 	              " onchange=\"setUTCFromLocalDateTimeForm('%s');",
             Id,ParamName,Id);
    if (SubmitFormOnChange)
-      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
+      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();return false;",
                Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Day = 1;
@@ -620,7 +620,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
                       " onchange=\"setUTCFromLocalDateTimeForm('%s');",
             Id,ParamName,Id);
    if (SubmitFormOnChange)
-      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
+      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();return false;",
                Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Hour = 0;
@@ -637,7 +637,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
                       " onchange=\"setUTCFromLocalDateTimeForm('%s');",
 	    Id,ParamName,Id);
    if (SubmitFormOnChange)
-      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
+      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();return false;",
                Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
 
@@ -658,7 +658,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
 			 " onchange=\"setUTCFromLocalDateTimeForm('%s');",
 	       Id,ParamName,Id);
       if (SubmitFormOnChange)
-	 fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
+	 fprintf (Gbl.F.Out,"document.getElementById('%s').submit();return false;",
 		  Gbl.Form.Id);
       fprintf (Gbl.F.Out,"\">");
       for (Second = 0;
@@ -829,7 +829,7 @@ void Dat_WriteFormDate (unsigned FirstYear,unsigned LastYear,
                       " onchange=\"adjustDateForm('%s');",
 	    Id,Id,Id);
    if (SubmitFormOnChange)
-      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
+      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();return false;",
                Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\"");
    if (Disabled)
@@ -854,7 +854,7 @@ void Dat_WriteFormDate (unsigned FirstYear,unsigned LastYear,
                       " onchange=\"adjustDateForm('%s');",
 	    Id,Id,Id);
    if (SubmitFormOnChange)
-      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
+      fprintf (Gbl.F.Out,"document.getElementById('%s').submit();return false;",
                Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\"");
    if (Disabled)
@@ -876,7 +876,7 @@ void Dat_WriteFormDate (unsigned FirstYear,unsigned LastYear,
    HTM_TD_Begin ("class=\"CM\"");
    fprintf (Gbl.F.Out,"<select id=\"%sDay\" name=\"%sDay\"",Id,Id);
    if (SubmitFormOnChange)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
                Gbl.Form.Id);
    if (Disabled)
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
diff --git a/swad_degree.c b/swad_degree.c
index ffc6027a3..a4de8f8ab 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -359,7 +359,7 @@ static void Deg_Configuration (bool PrintView)
       Frm_StartForm (ActChgDegCtrCfg);
       fprintf (Gbl.F.Out,"<select id=\"OthCtrCod\" name=\"OthCtrCod\""
 			 " class=\"INPUT_SHORT_NAME\""
-			 " onchange=\"document.getElementById('%s').submit();\">",
+			 " onchange=\"document.getElementById('%s').submit();return false;\">",
 	       Gbl.Form.Id);
       for (NumCtr = 0;
 	   NumCtr < Gbl.Hierarchy.Ins.Ctrs.Num;
@@ -598,7 +598,7 @@ void Deg_WriteSelectorOfDegree (void)
    Frm_StartFormGoTo (ActSeeCrs);
    fprintf (Gbl.F.Out,"<select id=\"deg\" name=\"deg\" class=\"HIE_SEL\"");
    if (Gbl.Hierarchy.Ctr.CtrCod > 0)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
                Gbl.Form.Id);
    else
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
@@ -770,7 +770,7 @@ static void Deg_ListDegreesForEdition (void)
 	 Frm_StartForm (ActChgDegTyp);
 	 Deg_PutParamOtherDegCod (Deg->DegCod);
 	 fprintf (Gbl.F.Out,"<select name=\"OthDegTypCod\" class=\"HIE_SEL_NARROW\""
-			    " onchange=\"document.getElementById('%s').submit();\">",
+			    " onchange=\"document.getElementById('%s').submit();return false;\">",
 		  Gbl.Form.Id);
 	 for (NumDegTyp = 0;
 	      NumDegTyp < Gbl.DegTypes.Num;
@@ -838,7 +838,7 @@ static void Deg_ListDegreesForEdition (void)
 	 Frm_StartForm (ActChgDegSta);
 	 Deg_PutParamOtherDegCod (Deg->DegCod);
 	 fprintf (Gbl.F.Out,"<select name=\"Status\" class=\"INPUT_STATUS\""
-			    " onchange=\"document.getElementById('%s').submit();\">"
+			    " onchange=\"document.getElementById('%s').submit();return false;\">"
 			    "<option value=\"%u\" selected=\"selected\">%s</option>"
 			    "<option value=\"%u\">%s</option>"
 			    "</select>",
diff --git a/swad_degree_type.c b/swad_degree_type.c
index 25510942b..d75554a46 100644
--- a/swad_degree_type.c
+++ b/swad_degree_type.c
@@ -111,7 +111,7 @@ void DT_WriteSelectorDegreeTypes (void)
 
    /* List degree types */
    fprintf (Gbl.F.Out,"<select id=\"OthDegTypCod\" name=\"OthDegTypCod\""
-	              " onchange=\"document.getElementById('%s').submit();\">",
+	              " onchange=\"document.getElementById('%s').submit();return false;\">",
             Gbl.Form.Id);
 
    fprintf (Gbl.F.Out,"<option value=\"-1\"");
diff --git a/swad_department.c b/swad_department.c
index bb04d7a8e..9b240a944 100644
--- a/swad_department.c
+++ b/swad_department.c
@@ -540,7 +540,7 @@ static void Dpt_ListDepartmentsForEdition (void)
       Frm_StartForm (ActChgDptIns);
       Dpt_PutParamDptCod (Dpt->DptCod);
       fprintf (Gbl.F.Out,"<select name=\"OthInsCod\" class=\"HIE_SEL_NARROW\""
-	                 "onchange=\"document.getElementById('%s').submit();\">"
+	                 "onchange=\"document.getElementById('%s').submit();return false;\">"
                          "<option value=\"0\"",
 	       Gbl.Form.Id);
       if (Dpt->InsCod == 0)
@@ -1109,7 +1109,7 @@ void Dpt_WriteSelectorDepartment (long InsCod,long DptCod,
 	    Dpt_PARAM_DPT_COD_NAME,Dpt_PARAM_DPT_COD_NAME,
 	    SelectClass);
    if (SubmitFormOnChange)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
                Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
 
diff --git a/swad_file_browser.c b/swad_file_browser.c
index b1d643874..021c77efe 100644
--- a/swad_file_browser.c
+++ b/swad_file_browser.c
@@ -3400,10 +3400,10 @@ static void Brw_ShowDataOwnerAsgWrk (struct UsrData *UsrDat)
    /***** Show user's email *****/
    if (UsrDat->Email[0])
      {
-      fprintf (Gbl.F.Out,"<br />"
-	                 "<a href=\"mailto:%s\" target=\"_blank\""
-	                 " class=\"AUTHOR_TXT\">%s",
-	      UsrDat->Email,UsrDat->Email);
+      fprintf (Gbl.F.Out,"<br />");
+      HTM_A_Begin ("href=\"mailto:%s\" target=\"_blank\" class=\"AUTHOR_TXT\"",
+	           UsrDat->Email);
+      fprintf (Gbl.F.Out,"%s",UsrDat->Email);
       HTM_A_End ();
      }
    Frm_EndForm ();
diff --git a/swad_form.c b/swad_form.c
index 76f819646..0768c90b1 100644
--- a/swad_form.c
+++ b/swad_form.c
@@ -134,7 +134,7 @@ static void Frm_StartFormInternal (Act_Action_t NextAction,bool PutParameterLoca
       fprintf (Gbl.F.Out,"\" id=\"%s\"",Id);
       if (OnSubmit)
          if (OnSubmit[0])
-            fprintf (Gbl.F.Out," onsubmit=\"%s\"",OnSubmit);
+            fprintf (Gbl.F.Out," onsubmit=\"%s;return false;\"",OnSubmit);
       switch (Act_GetBrowserTab (NextAction))
 	{
 	 case Act_BRW_NEW_TAB:
@@ -265,8 +265,7 @@ void Frm_LinkFormSubmitId (const char *Title,const char *LinkClass,
 			// before submitting the form
       if (OnSubmit[0])
          fprintf (Gbl.F.Out,"%s;",OnSubmit);
-   fprintf (Gbl.F.Out,"document.getElementById('%s').submit();"
-		      "return false;\">",
+   fprintf (Gbl.F.Out,"document.getElementById('%s').submit();return false;\">",
 	    Id);
   }
 
@@ -286,8 +285,7 @@ void Frm_LinkFormSubmitAnimated (const char *Title,const char *LinkClass,
       if (OnSubmit[0])
          fprintf (Gbl.F.Out,"%s;",OnSubmit);
    fprintf (Gbl.F.Out,"AnimateIcon(%d);"
-		      "document.getElementById('%s').submit();"
-		      "return false;\">",
+		      "document.getElementById('%s').submit();return false;\">",
 	    Gbl.Form.Num,
 	    Gbl.Form.Id);
   }
diff --git a/swad_group.c b/swad_group.c
index 2f69a17a8..665f616b6 100644
--- a/swad_group.c
+++ b/swad_group.c
@@ -1325,7 +1325,7 @@ static void Grp_ListGroupTypesForEdition (void)
       Grp_PutParamGrpTypCod (Gbl.Crs.Grps.GrpTypes.LstGrpTypes[NumGrpTyp].GrpTypCod);
       fprintf (Gbl.F.Out,"<select name=\"MandatoryEnrolment\""
 	                 " style=\"width:150px;\""
-	                 " onchange=\"document.getElementById('%s').submit();\">"
+	                 " onchange=\"document.getElementById('%s').submit();return false;\">"
                          "<option value=\"N\"",
                Gbl.Form.Id);
       if (!Gbl.Crs.Grps.GrpTypes.LstGrpTypes[NumGrpTyp].MandatoryEnrolment)
@@ -1347,7 +1347,7 @@ static void Grp_ListGroupTypesForEdition (void)
       Grp_PutParamGrpTypCod (Gbl.Crs.Grps.GrpTypes.LstGrpTypes[NumGrpTyp].GrpTypCod);
       fprintf (Gbl.F.Out,"<select name=\"MultipleEnrolment\""
 	                 " style=\"width:150px;\""
-	                 " onchange=\"document.getElementById('%s').submit();\">"
+	                 " onchange=\"document.getElementById('%s').submit();return false;\">"
                          "<option value=\"N\"",
                Gbl.Form.Id);
       if (!Gbl.Crs.Grps.GrpTypes.LstGrpTypes[NumGrpTyp].MultipleEnrolment)
@@ -1549,7 +1549,7 @@ static void Grp_ListGroupsForEdition (void)
          Frm_StartFormAnchor (ActChgGrpTyp,Grp_GROUPS_SECTION_ID);
          Grp_PutParamGrpCod (Grp->GrpCod);
          fprintf (Gbl.F.Out,"<select name=\"GrpTypCod\" style=\"width:100px;\""
-                            " onchange=\"document.getElementById('%s').submit();\">",
+                            " onchange=\"document.getElementById('%s').submit();return false;\">",
                   Gbl.Form.Id);
 
          /* Options for group types */
@@ -1584,7 +1584,7 @@ static void Grp_ListGroupsForEdition (void)
          Frm_StartFormAnchor (ActChgGrpCla,Grp_GROUPS_SECTION_ID);
          Grp_PutParamGrpCod (Grp->GrpCod);
 	 fprintf (Gbl.F.Out,"<select name=\"ClaCod\" style=\"width:100px;\""
-                            " onchange=\"document.getElementById('%s').submit();\">",
+                            " onchange=\"document.getElementById('%s').submit();return false;\">",
                   Gbl.Form.Id);
 
 	 /* Option for no assigned classroom */
diff --git a/swad_holiday.c b/swad_holiday.c
index 7b88974fa..af4a4de7b 100644
--- a/swad_holiday.c
+++ b/swad_holiday.c
@@ -586,7 +586,7 @@ static void Hld_ListHolidaysForEdition (void)
       Frm_StartForm (ActChgHldPlc);
       Hld_PutParamHldCod (Hld->HldCod);
       fprintf (Gbl.F.Out,"<select name=\"PlcCod\" class=\"PLC_COD\""
-	                 " onchange=\"document.getElementById('%s').submit();\">"
+	                 " onchange=\"document.getElementById('%s').submit();return false;\">"
                          "<option value=\"-1\"",
 	       Gbl.Form.Id);
       if (Hld->PlcCod <= 0)
@@ -609,7 +609,7 @@ static void Hld_ListHolidaysForEdition (void)
       Frm_StartForm (ActChgHldTyp);
       Hld_PutParamHldCod (Hld->HldCod);
       fprintf (Gbl.F.Out,"<select name=\"HldTyp\" style=\"width:62px;\""
-	                 " onchange=\"document.getElementById('%s').submit();\">",
+	                 " onchange=\"document.getElementById('%s').submit();return false;\">",
 	       Gbl.Form.Id);
       for (HolidayType = (Hld_HolidayType_t) 0;
 	   HolidayType < Hld_NUM_TYPES_HOLIDAY;
diff --git a/swad_institution.c b/swad_institution.c
index 9294d9cb1..d6fc63adc 100644
--- a/swad_institution.c
+++ b/swad_institution.c
@@ -371,7 +371,7 @@ static void Ins_Configuration (bool PrintView)
       Frm_StartForm (ActChgInsCtyCfg);
       fprintf (Gbl.F.Out,"<select id=\"OthCtyCod\" name=\"OthCtyCod\""
 			 " class=\"INPUT_SHORT_NAME\""
-			 " onchange=\"document.getElementById('%s').submit();\">",
+			 " onchange=\"document.getElementById('%s').submit();return false;\">",
 	       Gbl.Form.Id);
       for (NumCty = 0;
 	   NumCty < Gbl.Hierarchy.Sys.Ctys.Num;
@@ -1373,7 +1373,7 @@ void Ins_WriteSelectorOfInstitution (void)
    Frm_StartFormGoTo (ActSeeCtr);
    fprintf (Gbl.F.Out,"<select id=\"ins\" name=\"ins\" class=\"HIE_SEL\"");
    if (Gbl.Hierarchy.Cty.CtyCod > 0)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
                Gbl.Form.Id);
    else
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
@@ -1563,7 +1563,7 @@ static void Ins_ListInstitutionsForEdition (void)
 	 Frm_StartForm (ActChgInsSta);
 	 Ins_PutParamOtherInsCod (Ins->InsCod);
 	 fprintf (Gbl.F.Out,"<select name=\"Status\" class=\"INPUT_STATUS\""
-			    " onchange=\"document.getElementById('%s').submit();\">"
+			    " onchange=\"document.getElementById('%s').submit();return false;\">"
 			    "<option value=\"%u\" selected=\"selected\">%s</option>"
 			    "<option value=\"%u\">%s</option>"
 			    "</select>",
diff --git a/swad_language.c b/swad_language.c
index 2636e2582..0fa6da9d4 100644
--- a/swad_language.c
+++ b/swad_language.c
@@ -117,7 +117,7 @@ void Lan_PutSelectorToSelectLanguage (void)
    Frm_StartForm (ActReqChgLan);
    fprintf (Gbl.F.Out,"<select name=\"Lan\""
 	              " style=\"width:112px; margin:0;\""
-	              " onchange=\"document.getElementById('%s').submit();\">",
+	              " onchange=\"document.getElementById('%s').submit();return false;\">",
             Gbl.Form.Id);
    for (Lan = (Lan_Language_t) 1;
 	Lan <= Lan_NUM_LANGUAGES;
diff --git a/swad_match.c b/swad_match.c
index afc2fb85c..cdc000e0e 100644
--- a/swad_match.c
+++ b/swad_match.c
@@ -2406,33 +2406,31 @@ static void Mch_PutCheckboxResult (struct Match *Match)
    extern const char *Txt_View_results;
 
    /***** Start container *****/
-   fprintf (Gbl.F.Out,"<div class=\"MCH_SHOW_RESULTS\">");
+   HTM_DIV_Begin ("class=\"MCH_SHOW_RESULTS\"");
 
    /***** Start form *****/
    Frm_StartForm (ActChgVisResMchQst);
    Mch_PutParamMchCod (Match->MchCod);	// Current match being played
 
    /***** Put icon with link *****/
-   fprintf (Gbl.F.Out,"<div class=\"CONTEXT_OPT\">"
-	              "<a href=\"\" class=\"ICO_HIGHLIGHT\""
-	              " title=\"%s\" "
-	              " onclick=\"document.getElementById('%s').submit();"
-	              " return false;\">"
-	              "<i class=\"%s\"></i>"
-	              "&nbsp;%s"
-	              "</a>"
-	              "</div>",
-	    Txt_View_results,
-	    Gbl.Form.Id,
+   HTM_DIV_Begin ("class=\"CONTEXT_OPT\"");
+   HTM_A_Begin ("href=\"\" class=\"ICO_HIGHLIGHT\" title=\"%s\" "
+		" onclick=\"document.getElementById('%s').submit();return false;\"",
+	        Txt_View_results,
+	        Gbl.Form.Id);
+   fprintf (Gbl.F.Out,"<i class=\"%s\"></i>"
+	              "&nbsp;%s",
 	    Match->Status.ShowQstResults ? "fas fa-toggle-on" :
 		                           "fas fa-toggle-off",
 	    Txt_View_results);
+   HTM_A_End ();
+   HTM_DIV_End ();
 
    /***** End form *****/
    Frm_EndForm ();
 
    /***** End container *****/
-   fprintf (Gbl.F.Out,"</div>");
+   HTM_DIV_End ();
   }
 
 /*****************************************************************************/
@@ -2587,8 +2585,8 @@ static void Mch_ShowQuestionAndAnswersStd (struct Match *Match)
 	    Gam_PutParamQstInd (Match->Status.QstInd);	// Current question index shown
 	    Mch_PutParamNumOpt (NumOpt);		// Number of button
 	    fprintf (Gbl.F.Out,"<button type=\"submit\""
-			       " onmousedown=\"document.getElementById('%s').submit();"
-			       "return false;\" class=\"",
+			       " onmousedown=\"document.getElementById('%s').submit();return false;\""
+			       " class=\"",
 		     Gbl.Form.Id);
 	    if (UsrAnswer.NumOpt == (int) NumOpt)	// Student's answer
 	       fprintf (Gbl.F.Out,"MCH_STD_ANSWER_SELECTED ");
diff --git a/swad_photo.c b/swad_photo.c
index 230f0fa14..fa0b9fec2 100644
--- a/swad_photo.c
+++ b/swad_photo.c
@@ -767,7 +767,8 @@ static bool Pho_ReceivePhotoAndDetectFaces (bool ItsMe,const struct UsrData *Usr
         	      "form_%d",
 		      NumLastForm + NumFace);
             fprintf (Gbl.F.Out,"<area shape=\"circle\""
-                               " href=\"javascript:document.getElementById('%s').submit();\""
+                               " href=\"\""
+                               " onclick=\"javascript:document.getElementById('%s').submit();return false;\""
                                " coords=\"%u,%u,%u\">\n",
                      FormId,X,Y,Radius);
            }
@@ -1797,7 +1798,7 @@ static void Pho_PutSelectorForTypeOfAvg (void)
    Pho_PutHiddenParamOrderDegrees ();
    Usr_PutParamsPrefsAboutUsrList ();
    fprintf (Gbl.F.Out,"<select id=\"AvgType\" name=\"AvgType\""
-                      " onchange=\"document.getElementById('%s').submit();\">",
+                      " onchange=\"document.getElementById('%s').submit();return false;\">",
             Gbl.Form.Id);
    for (TypeOfAvg = (Pho_AvgPhotoTypeOfAverage_t) 0;
 	TypeOfAvg < Pho_NUM_AVERAGE_PHOTO_TYPES;
@@ -1862,7 +1863,7 @@ static void Pho_PutSelectorForHowComputePhotoSize (void)
    Pho_PutHiddenParamOrderDegrees ();
    Usr_PutParamsPrefsAboutUsrList ();
    fprintf (Gbl.F.Out,"<select id=\"PhotoSize\" name=\"PhotoSize\""
-                      " onchange=\"document.getElementById('%s').submit();\">",
+                      " onchange=\"document.getElementById('%s').submit();return false;\">",
             Gbl.Form.Id);
    for (PhoSi = (Pho_HowComputePhotoSize_t) 0;
 	PhoSi < Pho_NUM_HOW_COMPUTE_PHOTO_SIZES;
@@ -1927,7 +1928,7 @@ static void Pho_PutSelectorForHowOrderDegrees (void)
    Pho_PutHiddenParamPhotoSize ();
    Usr_PutParamsPrefsAboutUsrList ();
    fprintf (Gbl.F.Out,"<select id=\"Order\" name=\"Order\""
-                      " onchange=\"document.getElementById('%s').submit();\">",
+                      " onchange=\"document.getElementById('%s').submit();return false;\">",
             Gbl.Form.Id);
    for (Order = (Pho_HowOrderDegrees_t) 0;
 	Order < Pho_NUM_HOW_ORDER_DEGREES;
diff --git a/swad_record.c b/swad_record.c
index e5f0629a3..e17b27399 100644
--- a/swad_record.c
+++ b/swad_record.c
@@ -333,7 +333,7 @@ void Rec_ListFieldsRecordsForEdition (void)
       Frm_StartForm (ActChgVisFie);
       Par_PutHiddenParamLong (NULL,"FieldCod",Gbl.Crs.Records.LstFields.Lst[NumField].FieldCod);
       fprintf (Gbl.F.Out,"<select name=\"Visibility\""
-                         " onchange=\"document.getElementById('%s').submit();\">",
+                         " onchange=\"document.getElementById('%s').submit();return false;\">",
                Gbl.Form.Id);
       for (Vis = (Rec_VisibilityRecordFields_t) 0;
 	   Vis < (Rec_VisibilityRecordFields_t) Rec_NUM_TYPES_VISIBILITY;
@@ -4019,7 +4019,7 @@ static void Rec_ShowFormMyInsCtrDpt (bool IAmATeacher)
    Frm_StartFormAnchor (ActChgCtyMyIns,Rec_MY_INS_CTR_DPT_ID);
    fprintf (Gbl.F.Out,"<select id=\"OthCtyCod\" name=\"OthCtyCod\""
 		      " class=\"REC_C2_BOT_INPUT\""
-	              " onchange=\"document.getElementById('%s').submit();\">"
+	              " onchange=\"document.getElementById('%s').submit();return false;\">"
                       "<option value=\"-1\"",
 	    Gbl.Form.Id);
    if (Gbl.Usrs.Me.UsrDat.InsCtyCod <= 0)
@@ -4062,7 +4062,7 @@ static void Rec_ShowFormMyInsCtrDpt (bool IAmATeacher)
    Frm_StartFormAnchor (ActChgMyIns,Rec_MY_INS_CTR_DPT_ID);
    fprintf (Gbl.F.Out,"<select id=\"OthInsCod\" name=\"OthInsCod\""
 		      " class=\"REC_C2_BOT_INPUT\""
-	              " onchange=\"document.getElementById('%s').submit();\">"
+	              " onchange=\"document.getElementById('%s').submit();return false;\">"
                       "<option value=\"-1\"",
 	    Gbl.Form.Id);
    if (Gbl.Usrs.Me.UsrDat.InsCod < 0)
@@ -4112,7 +4112,7 @@ static void Rec_ShowFormMyInsCtrDpt (bool IAmATeacher)
       Frm_StartFormAnchor (ActChgMyCtr,Rec_MY_INS_CTR_DPT_ID);
       fprintf (Gbl.F.Out,"<select id=\"OthCtrCod\" name=\"OthCtrCod\""
 		         " class=\"REC_C2_BOT_INPUT\""
-			 " onchange=\"document.getElementById('%s').submit();\">"
+			 " onchange=\"document.getElementById('%s').submit();return false;\">"
 			 "<option value=\"-1\"",
 	       Gbl.Form.Id);
       if (Gbl.Usrs.Me.UsrDat.Tch.CtrCod < 0)
diff --git a/swad_role.c b/swad_role.c
index 1bcdf8f41..3aef11e6b 100644
--- a/swad_role.c
+++ b/swad_role.c
@@ -477,7 +477,7 @@ void Rol_PutFormToChangeMyRole (const char *ClassSelect)
    if (ClassSelect)
       if (ClassSelect[0])
          fprintf (Gbl.F.Out," class=\"%s\"",ClassSelect);
-   fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\">",
+   fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\">",
             Gbl.Form.Id);
    for (Role = Rol_GST;
         Role < Rol_NUM_ROLES;
diff --git a/swad_scope.c b/swad_scope.c
index 6d8d8f39a..ae085b0a5 100644
--- a/swad_scope.c
+++ b/swad_scope.c
@@ -75,7 +75,7 @@ void Sco_PutSelectorScope (const char *ParamName,bool SendOnChange)
 
    fprintf (Gbl.F.Out,"<select id=\"%s\" name=\"%s\"",ParamName,ParamName);
    if (SendOnChange)
-      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
+      fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\"",
                Gbl.Form.Id);
    fprintf (Gbl.F.Out,">");
 
diff --git a/swad_statistic.c b/swad_statistic.c
index db904cb54..1653f0993 100644
--- a/swad_statistic.c
+++ b/swad_statistic.c
@@ -2078,7 +2078,7 @@ static void Sta_ShowDistrAccessesPerDayAndHour (unsigned long NumRows,MYSQL_RES
    HTM_LABEL_Begin ("class=\"%s\"",The_ClassFormInBox[Gbl.Prefs.Theme]);
    fprintf (Gbl.F.Out,"%s:&nbsp;"
                       "<select name=\"ColorType\""
-                      " onchange=\"document.getElementById('%s').submit();\">",
+                      " onchange=\"document.getElementById('%s').submit();return false;\">",
             Txt_Color_of_the_graphic,
             Gbl.Form.Id);
    for (ColorType = (Sta_ColorType_t) 0;
diff --git a/swad_string.c b/swad_string.c
index fc7e3dad2..4b401565e 100644
--- a/swad_string.c
+++ b/swad_string.c
@@ -333,8 +333,7 @@ void Str_InsertLinks (char *Txt,unsigned long MaxLength,size_t MaxCharsURLOnScre
 	    snprintf (Anchor2Nick,sizeof (Anchor2Nick),
 		      "\">"
 		      "<a href=\"\""
-		      " onclick=\"document.getElementById('%s').submit();"
-		      "return false;\">",
+		      " onclick=\"document.getElementById('%s').submit();return false;\">",
 		      Gbl.Usrs.Me.Logged ? Gbl.Form.UniqueId :
 			                   Gbl.Form.Id);
 	    Anchor2NickLength = strlen (Anchor2Nick);
diff --git a/swad_syllabus.c b/swad_syllabus.c
index 04c19c027..87c3f947b 100644
--- a/swad_syllabus.c
+++ b/swad_syllabus.c
@@ -920,7 +920,7 @@ static void Syl_PutFormItemSyllabus (bool NewItem,unsigned NumItem,int Level,int
 	           Txt_Enter_a_new_item_here);
    if (NewItem)
       fprintf (Gbl.F.Out," autofocus=\"autofocus\"");
-   fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\" />",
+   fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();return false;\" />",
 	    Gbl.Form.Id);
    Frm_EndForm ();
    HTM_TD_End ();
diff --git a/swad_timetable.c b/swad_timetable.c
index 711bf2411..af1f4be1b 100644
--- a/swad_timetable.c
+++ b/swad_timetable.c
@@ -1597,7 +1597,7 @@ static void TT_TimeTableDrawCell (unsigned Weekday,unsigned Interval,unsigned Co
 
 	 /***** Class type *****/
 	 fprintf (Gbl.F.Out,"<select name=\"TTTyp\" class=\"TT_TYP\""
-	                    " onchange=\"document.getElementById('%s').submit();\">",
+	                    " onchange=\"document.getElementById('%s').submit();return false;\">",
 	          Gbl.Form.Id);
 	 for (CT = (TT_ClassType_t) 0;
 	      CT < (TT_ClassType_t) TT_NUM_CLASS_TYPES;
@@ -1637,7 +1637,7 @@ static void TT_TimeTableDrawCell (unsigned Weekday,unsigned Interval,unsigned Co
 	   {
 	    /***** Class duration *****/
 	    fprintf (Gbl.F.Out,"<select name=\"TTDur\" class=\"TT_DUR\""
-		               " onchange=\"document.getElementById('%s').submit();\">",
+		               " onchange=\"document.getElementById('%s').submit();return false;\">",
 		     Gbl.Form.Id);
             for (i = Interval + TT_TimeTable[Weekday][Interval].Columns[Column].DurationIntervals;
         	 i < Gbl.TimeTable.Config.IntervalsPerDay;
@@ -1670,7 +1670,7 @@ static void TT_TimeTableDrawCell (unsigned Weekday,unsigned Interval,unsigned Co
 	       HTM_LABEL_End ();
 	       fprintf (Gbl.F.Out,"<select id=\"TTGrp%s\" name=\"TTGrp\""
 	                          " class=\"TT_GRP\""
-		                  " onchange=\"document.getElementById('%s').submit();\">",
+		                  " onchange=\"document.getElementById('%s').submit();return false;\">",
 			CellStr,
 			Gbl.Form.Id);
                fprintf (Gbl.F.Out,"<option value=\"-1\"");
@@ -1711,7 +1711,7 @@ static void TT_TimeTableDrawCell (unsigned Weekday,unsigned Interval,unsigned Co
 	       fprintf (Gbl.F.Out,"<input id=\"TTInf%s\" name=\"TTInf\""
 	                          " type=\"text\" size=\"1\" maxlength=\"%u\""
 	                          " value=\"%s\" class=\"TT_INF\""
-		                  " onchange=\"document.getElementById('%s').submit();\" />",
+		                  " onchange=\"document.getElementById('%s').submit();return false;\" />",
 			CellStr,
 			TT_MAX_CHARS_INFO,
 			Info ? Info :
@@ -1728,7 +1728,7 @@ static void TT_TimeTableDrawCell (unsigned Weekday,unsigned Interval,unsigned Co
                fprintf (Gbl.F.Out,"<input id=\"TTInf%s\" name=\"TTInf\""
                                   " type=\"text\" size=\"12\" maxlength=\"%u\""
                                   " value=\"%s\" class=\"TT_INF\""
-		                  " onchange=\"document.getElementById('%s').submit();\" />",
+		                  " onchange=\"document.getElementById('%s').submit();return false;\" />",
 			CellStr,
 			TT_MAX_CHARS_INFO,Info,
 			Gbl.Form.Id);
diff --git a/swad_user.c b/swad_user.c
index 960838ee0..e1011ee52 100644
--- a/swad_user.c
+++ b/swad_user.c
@@ -8939,7 +8939,7 @@ void Usr_PutSelectorNumColsClassPhoto (void)
    /***** Start selector *****/
    HTM_LABEL_Begin ("class=\"%s\"",The_ClassFormInBox[Gbl.Prefs.Theme]);
    fprintf (Gbl.F.Out,"<select name=\"ColsClassPhoto\""
-                      " onchange=\"document.getElementById('%s').submit();\">",
+                      " onchange=\"document.getElementById('%s').submit();return false;\">",
 	    Gbl.Form.Id);
 
    /***** Put a row in selector for every number from 1 to Usr_CLASS_PHOTO_COLS_MAX *****/