I've got this: class logwatch(athena.LiveFragment): jsClass = u"app.logwatch" docFactory = loaders.stan( T.div(render=T.directive('liveFragment'))[ T.div(id='content'), ]) def msg(self, m): return self.callRemote('msg', m) ...and in app.js app.logwatch = Nevow.Athena.Widget.subclass('app.logwatch'); app.logwatch.methods( function msg(self, m) { // MochiKit is included... appendChildNodes( self.nodeById('content'), P(null, m) ); }) This fails for some reason - I think because the HTML the page generates looks like this: <div id="athena:1" xmlns:athena="http://divmod.org/ns/athena/0.7" athena:class="app.logwatch"> logs <div id="athenaid:1-athenaid:1-content"/> </div> ...node the athena node id prefixs the child IDs twice? Also, the exception this code generates under Firefox (2.0.0.4) also breaks the javascript-python exception bridge code: File "/usr/lib64/python2.5/site-packages/twisted/internet/defer.py", line 107, in maybeDeferred result = f(*args, **kw) File "/usr/lib/python2.5/site-packages/nevow/athena.py", line 434, in renderHTTP response = self.messageDeliverer.basketCaseReceived(ctx, messageData) File "/usr/lib/python2.5/site-packages/nevow/athena.py", line 638, in basketCaseReceived self.livePage.liveTransportMessageReceived(ctx, msg) File "/usr/lib/python2.5/site-packages/nevow/athena.py", line 886, in liveTransportMessageReceived method(ctx, *args) File "/usr/lib/python2.5/site-packages/nevow/athena.py", line 929, in action_respond callDeferred.errback(getJSFailure(result, self.jsModules.mapping)) File "/usr/lib/python2.5/site-packages/nevow/athena.py", line 403, in getJSFailure text = '%s: %s' % (exc[u'name'], exc[u'message']) exceptions.KeyError: u'name' Ideas?