title: Qt widget shape from image
body: <p>How can I create a widget or window that will be just a transparent image?
  I mean something like in this program: <a href="http://ssp.shillest.net/" rel="nofollow">sakura script player</a><br />
  What i tried is:</p>
  
  <pre><code>label = QtGui.QLabel(None,
                      QtCore.Qt.FramelessWindowHint | QtCore.Qt.WindowStaysOnTopHint)
  label.setPixmap(QtGui.QPixmap('c:\transparent.png'))
  label.setScaledContents(True)
  
  label.show()
  </code></pre>
  
  <p>but it generates just a rectangle window, in spite of image's transparency</p>