diff --git a/public/javascripts/announcement_refresh.js b/public/javascripts/announcement_refresh.js
new file mode 100644
--- /dev/null
+++ b/public/javascripts/announcement_refresh.js
@@ -0,0 +1,33 @@
+
+var Announcement = {
+
+    mostRecentId: 0,
+
+    setMostRecentId: function(id) {
+	Announcement.mostRecentId = id;
+    },
+
+    updateRecentId: function(id) {
+	if(Announcement.mostRecentId < id)
+	    Announcement.mostRecentId = id;
+    },
+
+    refreshAnnouncement: function() {
+	var url = '/main/announcements';
+	new Ajax.Request(url, {
+	    method: 'get',
+	    parameters: { recent: Announcement.mostRecentId },
+	    onSuccess: function(transport) {
+		var announcementBody = 	$("announcementbox-body");
+		announcementBody.insert({ top: transport.responseText });
+	    }
+	});
+	Announcement.registerRefreshEventTimer();
+    },
+
+    registerRefreshEventTimer: function() {
+	setTimeout(function () {
+	    Announcement.refreshAnnouncement();
+	}, 30000);
+    }
+};
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