opensocial Notifications

[CiNtax]

I've been working with opensocial recently, but have been having trouble using notifications. The code I have is: \[code\]<?xml version="1.0" encoding="UTF-8"?><Module> <ModulePrefs title="Notifications" description="" height="300"> <Require feature="opensocial-0.8"/></ModulePrefs><Content type="html"><![CDATA[ <script type="text/javascript"> function sendNotification(title, body) { var params = {}; params[opensocial.Message.Field.TITLE] = title; params[opensocial.Message.Field.TYPE] = opensocial.Message.Type.NOTIFICATION; var message = opensocial.newMessage(body, params); var recipient = "VIEWER"; opensocial.requestSendMessage(recipient, message, callback); }; function callback(data) { if (data.hadError()) { alert("There was a problem:" + data.getErrorCode()); } else { alert("Ok"); } }; sendNotification("This is a test notification", "How are you doing?"); </script>]]></Content></Module>\[/code\]When I install and run this gadget, I don't get any alerts or notifications, and I'm pretty stumped! Any ideas?