diff --git a/main/exercise/exercise_submit.php b/main/exercise/exercise_submit.php
index 3a3c2bee62..734d7212d2 100755
--- a/main/exercise/exercise_submit.php
+++ b/main/exercise/exercise_submit.php
@@ -1164,13 +1164,13 @@ if (!empty($error)) {
 
             $("form#exercise_form").prepend($("#exercise-description"));
         
-            $('button[name="previous_question_and_save"]').on("touchstart click", function (e) {
+            $(\'button[name="previous_question_and_save"]\').on("touchstart click", function (e) {
                 e.preventDefault();
                 e.stopPropagation();    
                 var
                     $this = $(this),
-                    previousId = parseInt($this.data('prev')) || 0,
-                    questionId = parseInt($this.data('question')) || 0;
+                    previousId = parseInt($this.data(\'prev\')) || 0,
+                    questionId = parseInt($this.data(\'question\')) || 0;
 
                 previous_question_and_save(previousId, questionId);
             });
@@ -1238,13 +1238,13 @@ if (!empty($error)) {
 
         function save_now(question_id, url_extra) {
             //1. Normal choice inputs
-            var my_choice = $('*[name*="choice['+question_id+']"]').serialize();
+            var my_choice = $(\'*[name*="choice['+question_id+']"]\').serialize();
 
             //2. Reminder checkbox
-            var remind_list = $('*[name*="remind_list"]').serialize();
+            var remind_list = $(\'*[name*="remind_list"]\').serialize();
 
             //3. Hotspots
-            var hotspot = $('*[name*="hotspot['+question_id+']"]').serialize();
+            var hotspot = $(\'*[name*="hotspot['+question_id+']"]\').serialize();
             
             // Checking FCK
             if (question_id) {