Add fallback in case the video doesn't work.

Site/2013-05/js/main.js

@@ -4,6 +4,13 @@ $(function(){
     window.onscroll = function() {
         document.getElementById("scrollDown").style.opacity = Math.max(0, 200 - window.scrollY) / 200;
     };
+
+    if (document.location.hash == "#video")
+        toggleMovie();
+
+    $("video")[0].addEventListener("playing", function() {
+        $(this).parents().find(".fallback").hide();
+    }, true);
 });
 
 function toggleMovie() {