From: Jeff Walden <jwalden@mit.edu>

Fix spelling error.

diff --git a/content/reply.js b/content/reply.js
--- a/content/reply.js
+++ b/content/reply.js
@@ -51,7 +51,7 @@ var ReplyDialog = {
     }
 
     // TODO error handling!
-    alert("Sorry, but an error occured!\n" + req.status + "\n" +
+    alert("Sorry, but an error occurred!\n" + req.status + "\n" +
           req.responseText);
     return false;
   },