sass/compass mixin for returning background path, background position, width and height

mixin

@mixin sprite_url_height_width($sprite_name, $image_name) {
  background: sprite($sprite_name, $image_name) no-repeat;
  width: image-width(sprite-file($sprite_name, $image_name));
  height: image-height(sprite-file($sprite_name, $image_name));
}

var to hold sprite

$sprite_name: sprite-map('folder/*.png', $spacing: 20px);