Using Compass to generate normal and retina sprite maps

compass-retina-sprites.scss �M��GV �ݵ�GV $sprites: sprite-map("sprites/*.png"); $sprites-retina: sprite-map("sprites-retina/*.png"); @mixin sprite-background($name) { background-image: sprite-url($sprites); background-position: sprite-position($sprites, $name); background-repeat: no-repeat; display: block; height: image-height(sprite-file($sprites, $name)); width: image-width(sprite-file($sprites,