def inputHandler(evt: KeyPressEvent) = {
      if (evt.getNativeEvent().getKeyCode() == KeyCodes.KEY_ENTER) {
        val text = GUI.input.getText()
        GUI.input.setText("")
        evt.preventDefault()
        val req = new RequestBuilder(RequestBuilder.POST,"/dmchat/send")
        req.setRequestData("user="+user+"&message="+URL.encodeQueryString(text))
        req.setCallback(new RequestCallback {
          override def onError(request: Request, exc: Throwable) = {
            GUI.chat.add(new Label("message send failed: "+exc.getMessage()))
          }
          override def onResponseReceived(req: Request, response: Response) = {
          }
        })
        req.send
        ()
      }
    }