diff -r 0b0fe49e5251 -r 27441b099984 util/jid.lua
--- a/util/jid.lua	Sun Nov 29 21:32:39 2009 +0100
+++ b/util/jid.lua	Sun Nov 29 21:33:37 2009 +0100
@@ -65,4 +65,17 @@
 	return host;
 end
 
+function join(node, host, resource)
+	if node and host and resource then
+		return node.."@"..host.."/"..resource;
+	elseif node and host then
+		return node.."@"..host;
+	elseif host and resource then
+		return host.."/"..resource;
+	elseif host then
+		return host;
+	end
+	return nil; -- Invalid JID
+end
+
 return _M;