sprites mixin

_sprites.sass

@mixin dimensions($width,$height)
  width: $width
  height: $height

@mixin sprite($x_offset,$y_offset)
  background: image_url('sprites.png') no-repeat $x_offset $y_offset

@mixin spriteblock($width,$height,$bg_x_offset,$bg_y_offset)
  display: block
  text-indent: -9999px
  overflow: hidden
  @include dimensions($width,$height)
  @include sprite($bg_x_offset,$bg_y_offset)

@mixin bgpos($x_offset,$y_offset)
  background-position: $x_offset $y_offset