retrieve inline discussion by ajax

lms/templates/courseware.html

@@ -36,6 +36,10 @@
     document.write('\x3Cscript type="text/javascript" src="' +
         document.location.protocol + '//www.youtube.com/player_api">\x3C/script>');
   </script>
+
+  <script type="text/javascript">
+    var $$course_id = "${course.id}";
+  </script>
 </%block>
 
 <%include file="course_navigation.html" args="active_page='courseware'" />

lms/templates/discussion/_show_discussion.html

@@ -0,0 +1,3 @@
+<div class="discussion-module">
+  <a class="discussion-show control-button" href="javascript:void(0)" discussion_id="${discussion_id}">Show Discussion</a>
+</div>