title: Problem with alpha blending in XNA
body: <p>Hi
  i have a background and two png sprites
  I want to make <a href="http://dl.dropbox.com/u/4152145/xnatesting4.jpg" rel="nofollow">this effect</a> using the provided background and sprites using XNA 3.1<br>
  I'm doing something wrong because i only get <a href="http://dl.dropbox.com/u/4152145/xnatesting5.jpg" rel="nofollow">this</a> As you noticed its not the effect i wanna do<br>
  It is possible do this effect with a few lines of code using alpha blending in XNA 3.1? A practical example would be really great!</p>