SASS mixins for roundcorners

gistfile1.sass

// Example of a whole load of mixins to make round corners 
// (including individual corners) easy to remember in SASS
@mixin roundcorners($radius) {
    -moz-border-radius: $radius;    // firefox
    -webkit-border-radius: $radius; // safari/chrome
    border-radius: $radius;         // CSS3, works in IE9
}

@mixin roundcorner1($radius, $corner: "top-left") {
    -moz-border-#{$corner}-radius:    $radius ; // firefox
    -webkit-border-#{$corner}-radius: $radius;  // safari/chrome
    border-#{$corner}-radius:         $radius;  // CSS3, works in IE9
}
@mixin squarecorner1($corner: "top-left") {
    @include roundcorner1(0px, $corner);
}

@mixin roundcornerTL($radius:5px) { @include roundcorner1($radius, "top-left");     }
@mixin roundcornerTR($radius:5px) { @include roundcorner1($radius, "top-right");    }
@mixin roundcornerBL($radius:5px) { @include roundcorner1($radius, "bottom-left");  }
@mixin roundcornerBR($radius:5px) { @include roundcorner1($radius, "bottom-right"); }
@mixin squarecornerTL()           { @include roundcornerTL(0px);     }
@mixin squarecornerTR()           { @include roundcornerTR(0px);     }
@mixin squarecornerBL()           { @include roundcornerBL(0px);     }
@mixin squarecornerBR()           { @include roundcornerBR(0px);     }

// Most simplistic application of above
.rounded { 
  @include roundcorners(5px);
}

.roundedTop { 
  @include roundcornerTL(5px);
  @include roundcornerTR(5px);
}