Use hightlight effect for post updates

boards/static/js/thread_update.js

@@ -32,6 +32,7 b' var POST_UPDATED = 1;'
 var JS_AUTOUPDATE_PERIOD = 20000;
 // TODO This needs to be the same for attachment download time limit.
 var POST_AJAX_TIMEOUT = 30000;
+var BLINK_SPEED = 500;
 
 var ALLOWED_FOR_PARTIAL_UPDATE = [
     'refmap',
@@ -198,12 +199,7 b' function updatePost(postHtml) {'
  * Initiate a blinking animation on a node to show it was updated.
  */
 function blink(node) {
-    var blinkCount = 2;
-
-    var nodeToAnimate = node;
-    for (var i = 0; i < blinkCount; i++) {
-        nodeToAnimate = nodeToAnimate.fadeTo('fast', 0.5).fadeTo('fast', 1.0);
-    }
+    node.effect('highlight', {}, BLINK_SPEED);
 }
 
 function isPageBottom() {