diff --git a/app/views/layouts/default.html.erb b/app/views/layouts/default.html.erb
index 09e1fa9cb..721f3398d 100644
--- a/app/views/layouts/default.html.erb
+++ b/app/views/layouts/default.html.erb
@@ -71,6 +71,19 @@
   }
   </script>
   <script defer src="https://use.fontawesome.com/releases/v5.0.10/js/all.js" integrity="sha384-slN8GvtUJGnv6ca26v8EzVaR9DC58QEwsIk9q1QXdCU8Yu8ck/tL/5szYlBbqmS+" crossorigin="anonymous"></script>
+  <script>
+    window.Danbooru = {
+      notice: function(msg) {
+        console.warn("Danbooru.notice will be deprecated. Use $(window).trigger('danbooru:notice', msg) instead.")
+        $(window).trigger("danbooru:notice", msg);
+      },
+      error: function(msg) {
+        console.warn("Danbooru.error will be deprecated. Use $(window).trigger('danbooru:error', msg) instead.")
+        $(window).trigger("danbooru:error", msg);
+      }
+    }
+  </script>
+
 </head>
 <body lang="en" <%= body_attributes(CurrentUser.user) %>>
   <header id="top">
