Arrows to navigate to embedded posts.

app/assets/javascripts/discourse/models/post.js.coffee.erb

@@ -164,8 +164,10 @@ window.Discourse.Post = Ember.Object.extend Discourse.Presence,
     @set('loadingReplies', true)
     @set('replies', [])
     jQuery.getJSON "/posts/#{@get('id')}/replies", (loaded) =>      
-      loaded.each (reply) =>        
-        @get('replies').pushObject Discourse.Post.create(reply)
+      loaded.each (reply) =>          
+        post = Discourse.Post.create(reply)
+        post.set('topic', @get('topic'))
+        @get('replies').pushObject post
       @set('loadingReplies', false)
       promise.resolve()
     promise

app/assets/javascripts/discourse/templates/embedded_post.js.handlebars

@@ -11,7 +11,9 @@
 
     </div>
     <div class='span11 topic-body'>
+      {{#if view.previousPost}}<a href='{{unbound url}}' class="arrow"><i class='icon icon-arrow-up'></i></a>{{/if}}      
       {{{unbound cooked}}}
+      {{#unless view.previousPost}}<a href='{{unbound url}}' class="arrow"><i class='icon icon-arrow-down'></i></a>{{/unless}}
     </div>
   </div>
 {{/with}}

app/assets/javascripts/discourse/views/embedded_post_view.js.coffee

@@ -1,7 +1,6 @@
 window.Discourse.EmbeddedPostView = Ember.View.extend
   templateName: 'embedded_post'
   classNames: ['reply']
-  screenTrackBinding: 'postView.screenTrack'
 
   didInsertElement: ->
     postView = @get('postView') || @get('parentView.postView')

app/assets/javascripts/discourse/views/parent_view.js.coffee

@@ -1,5 +1,7 @@
 window.Discourse.ParentView = Discourse.EmbeddedPostView.extend
 
+  previousPost: true
+
   # Nice animation for when the replies appear
   didInsertElement: ->
     @_super()

app/assets/javascripts/discourse/views/post_view.js.coffee

@@ -100,6 +100,10 @@ window.Discourse.PostView = Ember.View.extend
       $('nav', $parent).addClass('toggled')
       Discourse.Post.loadByPostNumber post.get('topic_id'), post.get('reply_to_post_number'), (result) =>
         @set('loadingParent', false)
+
+        # Give the post a reference back to the topic
+        result.topic = @get('post.topic')
+        
         @set('parentPost', result)
 
     false

app/assets/stylesheets/application/topic-post.css.scss

@@ -427,6 +427,12 @@
         &:after {
           left: -9px;
         }
+
+        a.arrow {
+          float: right;
+          margin: 3px 0 3px 0;
+        }
+
       }
       .about {
         .contents {