book_url doesn't come from settings

lms/djangoapps/staticbook/views.py

+from django.conf import settings
 from django.contrib.auth.decorators import login_required
 from mitxmako.shortcuts import render_to_response
 
@@ -13,8 +14,10 @@ def index(request, course_id, book_index, page=0):
     textbook = course.textbooks[int(book_index)]
     table_of_contents = textbook.table_of_contents
 
+    book_url = settings.BOOK_URL    
+
     return render_to_response('staticbook.html',
-                              {'page': int(page), 'course': course,
+                              {'page': int(page), 'course': course, 'book_url': book_url,
                                'table_of_contents': table_of_contents,
                                'staff_access': staff_access})
 

lms/templates/staticbook.html

@@ -32,7 +32,7 @@ function goto_page(n) {
   if(n<10) {
     prefix="00";
   }
-  $("#bookpage").attr("src","${ settings.BOOK_URL }p"+prefix+n+".png");
+  $("#bookpage").attr("src","${ book_url }p"+prefix+n+".png");
   $.cookie("book_page", n, {'expires':3650, 'path':'/'});
 };
 
@@ -113,7 +113,7 @@ $("#open_close_accordion a").click(function(){
           </ul>
         </nav>
 
-        <img id="bookpage" src="${ settings.BOOK_URL }p${ "%03i"%(page) }.png">
+        <img id="bookpage" src="${ book_url }p${ "%03i"%(page) }.png">
       </section>
     </section>
   </div>