.image-ipod-nano-shared-buystrip-nano { background-image:url("http://images.apple.com/jp/ipod-nano/shared/images/buystrip_nano_large.jpg"); background-size:179px 151px; width:179px; height:151px; }
@media only screen and (-webkit-min-device-pixel-ratio: 1.5), only screen and (min-resolution: 144dpi), (-webkit-min-device-pixel-ratio: 144), (min-resolution: 144dppx) {
  .image-ipod-nano-shared-buystrip-nano { background-image:url("http://images.apple.com/jp/ipod-nano/shared/images/buystrip_nano_large_2x.jpg"); }
}