atnan

<style type="text/css">

#banner img { width: 240px; height: 56px; }
#banner img.retina { display: none; }

@media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (min-device-pixel-ratio: 2) {
  #banner img.non-retina { display: none; }
  #banner img.retina { display: block; }
}
</style>