JavaScript get clipboard data on paste event (Cross browser)

Question

How can a web application detect a paste event and retrieve the data to be pasted?

I would like to remove HTML content before the text is pasted into a rich text edi

Answer 1

First that comes to mind is the pastehandler of google's closure lib http://closure-library.googlecode.com/svn/trunk/closure/goog/demos/pastehandler.html