EDIT 1
Actually the version can be found in the file, open the file and search for version. In your question you'll find that it the jQuery lib is of version:"1.3.0-rc.1"
Old answer
Have you tried the http://jquerymobile.com/download/ page ? You can specify the version, instead of using the "latest" version like:
http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js