diff --git a/Course.php b/Course.php
index 9eb5f4a..e015043 100644
--- a/Course.php
+++ b/Course.php
@@ -584,7 +584,11 @@ where course_group_members_table.Course_Group_id=$id");
  <input type="hidden" name="groupid" value="'+id+'" > Enter Student ID to invite  <input type="text" name="student_id">\n\
 <input type="hidden" name="url" value="<?php echo $url; ?>">  <input type="hidden" name="courseid" value="<?php echo $course_id; ?>">    </form>').dialog({
      modal: true,
-     title:'Invite Students to Group',
+     title:'Invite students to group',
+     close: function () {
+         var closeBtn = $('.ui-dialog-titlebar-close');
+         closeBtn.html('');
+     },          
      buttons: {
          'Invite': function () {
 	     $('#frm').submit();
@@ -613,7 +617,11 @@ where course_group_members_table.Course_Group_id=$id");
  <input type="hidden" name="student_id" value="<?php echo $student_id; ?>" > \n\
 <input type="hidden" name="url" value="<?php echo $url; ?>">  <input type="hidden" name="courseid" value="<?php echo $course_id; ?>">    </form>').dialog({
      modal: true,
-     title:'Respond to Group Invite',
+     title:'Respond to group invitation',
+     close: function () {
+         var closeBtn = $('.ui-dialog-titlebar-close');
+         closeBtn.html('');
+     },          
      buttons: {
          'Confirm': function () {
 	     $('#frm').submit();
@@ -651,6 +659,10 @@ where course_group_members_table.Course_Group_id=$id");
 <input type="hidden" name="url" value="<?php echo $url; ?>"></form>').dialog({
      modal: true,
      title:'Kick out '+student_id+'?',
+     close: function () {
+         var closeBtn = $('.ui-dialog-titlebar-close');
+         closeBtn.html('');
+     },          
      buttons: {
          'Yes': function () {
 	     $('#frm').submit();
@@ -676,6 +688,10 @@ where course_group_members_table.Course_Group_id=$id");
 <input type="hidden" name="url" value="<?php echo $url; ?>"></form>').dialog({
      modal: true,
      title:'Delete this group?',
+     close: function () {
+         var closeBtn = $('.ui-dialog-titlebar-close');
+         closeBtn.html('');
+     },          
      buttons: {
          'Yes': function () {
 	     $('#frm').submit();
diff --git a/Courses.php b/Courses.php
index d72c3cf..5efc707 100644
--- a/Courses.php
+++ b/Courses.php
@@ -44,6 +44,10 @@ include 'Header.php';
                            </form>`).dialog({
 			       modal: true,
 			       title:'Extend deadline',
+			       close: function () {
+				   var closeBtn = $('.ui-dialog-titlebar-close');
+				   closeBtn.html('');
+			       },     
 			       buttons: {
 				   'Submit': function () {
 				       $('#frm').submit();
diff --git a/Submissions.php b/Submissions.php
index 4410a2d..45b6457 100644
--- a/Submissions.php
+++ b/Submissions.php
@@ -440,10 +440,14 @@ where course_group_members_table.Course_Group_id=$id");
                 <input type="hidden" name="labid" value="<?php echo $course_id; ?>">
                 <input type="hidden" name="header" value="<?php echo $header; ?>">
               </form>`).dialog({
-                modal: true,
-                title: 'Mark submission',
-                buttons: {
-                    'Submit': function() {
+                  modal: true,
+                  title: 'Mark submission',
+		  close: function () {
+		      var closeBtn = $('.ui-dialog-titlebar-close');
+		      closeBtn.html('');
+		  },     
+                  buttons: {
+                      'Submit': function() {
                         $('#submit-form').submit();
                         $(this).dialog('close');
                     },