Porting existing JS pages to GWT

I have some JS code which currently uses some pixel tracking images to
determine if a user is logged in (or not). The code is fairly simple
- Retrieve the image, if its 1x1 direct the user to a login page
otherwise refresh the page

I was wondering how I might either go about:
- Integrating the existing JS libraries into a GWT application
- Make calls to my GWT-RPC AppEngine GWT server application from JS
directly

Thanks in advance!

Sincerely,
Adam

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