Hi all,
i've found a solution without using the webservices. You can always access the Version history by this URL: http://<server>/<site>/_layouts/versions.aspx?list={litsID}&ID=<itemID>
I've done a simple http get with $.get(...) and append the table on the received Website with the verision history to some html element on my target Website. Done!
best,
Matthias