diff --git a/src/assets/js/backend_calendar_default_view.js b/src/assets/js/backend_calendar_default_view.js
index 77985f13..999a3ff3 100644
--- a/src/assets/js/backend_calendar_default_view.js
+++ b/src/assets/js/backend_calendar_default_view.js
@@ -459,13 +459,13 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
                             .add({ minutes: -minuteDelta })
                             .toString('yyyy-MM-dd HH:mm:ss');
 
-                    var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_save_unavailable';
-                    var postData = {
+                    var url = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_save_unavailable';
+                    var data = {
                         csrfToken: GlobalVariables.csrfToken,
                         unavailable: JSON.stringify(unavailable)
                     };
 
-                    $.post(postUrl, postData, function(response) {
+                    $.post(url, data, function(response) {
                         $('#notification').hide('blind');
                         revertFunc();
                     }, 'json').fail(GeneralFunctions.ajaxFailureHandler);
diff --git a/src/assets/js/backend_calendar_table_view.js b/src/assets/js/backend_calendar_table_view.js
index 1d611ca3..166b7415 100644
--- a/src/assets/js/backend_calendar_table_view.js
+++ b/src/assets/js/backend_calendar_table_view.js
@@ -318,56 +318,71 @@ window.BackendCalendarTableView = window.BackendCalendarTableView || {};
             $(this).parents().eq(2).popover('destroy'); // Hide the popover
 
             if (lastFocusedEventData.is_unavailable == false) {
-                var messageButtons = {};
-                messageButtons['OK'] = function() {
-                    var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_delete_appointment';
-                    var postData = {
-                        csrfToken: GlobalVariables.csrfToken,
-                        appointment_id : lastFocusedEventData['id'],
-                        delete_reason: $('#delete-reason').val()
-                    };
+                var buttons = [
+                    {
+                        text: 'OK',
+                        click: function() {
+                            var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_delete_appointment';
+                            var postData = {
+                                csrfToken: GlobalVariables.csrfToken,
+                                appointment_id : lastFocusedEventData['id'],
+                                delete_reason: $('#delete-reason').val()
+                            };
 
-                    $.post(postUrl, postData, function(response) {
-                        $('#message_box').dialog('close');
+                            $.post(postUrl, postData, function(response) {
+                                $('#message_box').dialog('close');
 
-                        if (response.exceptions) {
-                            response.exceptions = GeneralFunctions.parseExceptions(response.exceptions);
-                            GeneralFunctions.displayMessageBox(GeneralFunctions.EXCEPTIONS_TITLE,
-                                    GeneralFunctions.EXCEPTIONS_MESSAGE);
-                            $('#message_box').append(GeneralFunctions.exceptionsToHtml(response.exceptions));
-                            return;
+                                if (response.exceptions) {
+                                    response.exceptions = GeneralFunctions.parseExceptions(response.exceptions);
+                                    GeneralFunctions.displayMessageBox(GeneralFunctions.EXCEPTIONS_TITLE,
+                                        GeneralFunctions.EXCEPTIONS_MESSAGE);
+                                    $('#message_box').append(GeneralFunctions.exceptionsToHtml(response.exceptions));
+                                    return;
+                                }
+
+                                if (response.warnings) {
+                                    response.warnings = GeneralFunctions.parseExceptions(response.warnings);
+                                    GeneralFunctions.displayMessageBox(GeneralFunctions.WARNINGS_TITLE,
+                                        GeneralFunctions.WARNINGS_MESSAGE);
+                                    $('#message_box').append(GeneralFunctions.exceptionsToHtml(response.warnings));
+                                }
+
+                                // Refresh calendar event items.
+                                $('#select-filter-item').trigger('change');
+                            }, 'json').fail(GeneralFunctions.ajaxFailureHandler);
                         }
+                    },
 
-                        if (response.warnings) {
-                            response.warnings = GeneralFunctions.parseExceptions(response.warnings);
-                            GeneralFunctions.displayMessageBox(GeneralFunctions.WARNINGS_TITLE,
-                                    GeneralFunctions.WARNINGS_MESSAGE);
-                            $('#message_box').append(GeneralFunctions.exceptionsToHtml(response.warnings));
+                    {
+                        text: EALang.cancel,
+                        click: function() {
+                            $('#message_box').dialog('close');
                         }
-
-                        // Refresh calendar event items.
-                        $('#select-filter-item').trigger('change');
-                    }, 'json').fail(GeneralFunctions.ajaxFailureHandler);
-                };
-
-                messageButtons[EALang.cancel] = function() {
-                    $('#message_box').dialog('close');
-                };
+                    }
+                ];
 
                 GeneralFunctions.displayMessageBox(EALang.delete_appointment_title,
-                        EALang.write_appointment_removal_reason, messageButtons);
+                        EALang.write_appointment_removal_reason, buttons);
 
-                $('#message_box').append('<textarea id="delete-reason" rows="3"></textarea>');
-                $('#delete-reason').css('width', '100%');
+                var $formGroup = $('<div/>', {
+                    'class': 'form-group'
+                })
+                    .appendTo('#message_box');
+
+                $('<textarea/>', {
+                    'id': 'delete-reason',
+                    'class': 'form-control'
+                })
+                    .appendTo($formGroup);
             } else {
                 // Do not display confirmation promt.
-                var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_delete_unavailable';
-                var postData = {
+                var url = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_delete_unavailable';
+                var data = {
                     csrfToken: GlobalVariables.csrfToken,
                     unavailable_id : lastFocusedEventData.id
                 };
 
-                $.post(postUrl, postData, function(response) {
+                $.post(url, data, function(response) {
                     $('#message_box').dialog('close');
 
                     if (response.exceptions) {
diff --git a/src/assets/js/frontend_book.js b/src/assets/js/frontend_book.js
index dcbdc5e0..2b2634d2 100644
--- a/src/assets/js/frontend_book.js
+++ b/src/assets/js/frontend_book.js
@@ -279,22 +279,28 @@ window.FrontendBook = window.FrontendBook || {};
              * @param {jQuery.Event} event
              */
             $('#cancel-appointment').click(function(event) {
-                var dialogButtons = {};
-                dialogButtons['OK'] = function() {
-                    if ($('#cancel-reason').val() === '') {
-                        $('#cancel-reason').css('border', '2px solid red');
-                        return;
+                var buttons = [
+                    {
+                        text: 'OK',
+                        click: function() {
+                            if ($('#cancel-reason').val() === '') {
+                                $('#cancel-reason').css('border', '2px solid red');
+                                return;
+                            }
+                            $('#cancel-appointment-form textarea').val($('#cancel-reason').val());
+                            $('#cancel-appointment-form').submit();
+                        }
+                    },
+                    {
+                        text: EALang.cancel,
+                        click: function() {
+                            $('#message_box').dialog('close');
+                        }
                     }
-                    $('#cancel-appointment-form textarea').val($('#cancel-reason').val());
-                    $('#cancel-appointment-form').submit();
-                };
-
-                dialogButtons[EALang.cancel] = function() {
-                    $('#message_box').dialog('close');
-                };
+                ];
 
                 GeneralFunctions.displayMessageBox(EALang.cancel_appointment_title,
-                        EALang.write_appointment_removal_reason, dialogButtons);
+                        EALang.write_appointment_removal_reason, buttons);
 
                 $('#message_box').append('<textarea id="cancel-reason" rows="3"></textarea>');
                 $('#cancel-reason').css('width', '100%');