title: How can I get the state ("on" or "off") of the Google +1 button?
body: <p>The +1 API documentation is here: <a href="http://code.google.com/apis/+1button/#jsapi" rel="nofollow">http://code.google.com/apis/+1button/#jsapi</a></p>
  
  <p>There is no mention of how to determine whether the viewing user has already clicked the button or not.  This would be a very useful function because it would allow me to encourage people who haven't +1'd a page to do so without putting users who have already +1'd the page through a needless and possibly confusing step.</p>
  
  <p>Has anyone found a way to do this?  Thanks</p>