title: can you make an image transparent over another image in pygame?
body: <p>I'm able to set an image to be transparent using the both the <code>set_colorkey</code> method and the <code>convert_alpha</code> method over a surface background.  However, when I try to overlap two images the transparency is lost for some reason.  </p>
  
  <p>So to reiterate, is there a way to make part of an image transparent over another image (e.g. two png or gif files)</p>