=rounded(!radius = 2px)
  -moz-border-radius = !radius
  -webkit-border-radius = !radius

=notrounded
  -moz-border-radius = 0px
  -webkit-border-radius = 0px

=rounded-tl(!radius = 5px)
  -moz-border-radius-topleft = !radius
  -webkit-border-top-left-radius =  !radius

=rounded-tr(!radius = 5px)
  -moz-border-radius-topright =  !radius
  -webkit-border-top-right-radius =  !radius

=rounded-bl(!radius = 5px)
  -moz-border-radius-bottomleft =  !radius
  -webkit-border-bottom-left-radius =  !radius

=rounded-br(!radius = 5px)
  -moz-border-radius-bottomright =  !radius
  -webkit-border-bottom-right-radius =  !radius