title: fixed window-size in prettyphoto
body: <p>I'm using prettyphoto for a photo gallery in a django-app. My Images have a maximum height/width (with sorl-thumbnail), but the apect-ratios are different. Because of that, the window of prettyphoto also changes it's apect-ratio and the go-forward/go-back Buttons change positions (they move) everytime it loads the next/previous image. Is there a way to make prettyphoto have a fixed window size? Or add borders to the images so that their format is, for example, square. But I don't want to crop the image.</p>
  
  <p>Thanks in advance
  Jacques</p>