integrate vaadin as div

Hi,

i try to integrate vaadin app in jquery page as a div like in this useful
example
from this
blog

i add javascript to a page like this:


<script type="text/javascript">
            var vaadin = {
                vaadinConfigurations: {
                    'vaadin': {
                        appUri:'/testJQuery/vaadin',
                        pathInfo: '/',
                        versionInfo : {
                            vaadinVersion: "6.7.6",
                            applicationVersion: "NONVERSIONED"
                        }
                    }
                }};
            vaadin.debug=true;
   ...

is there any method in vaadin variable to say if vaadin application is loaded. I do some dom manipulation with jquery and i want do that only when vaadin elements are loaded.

regards

Walid