mixin for border-radius (without compass )

gistfile1.sass

@mixin border-radius($radius...) {
	// defining prefixes so we can use them in mixins below
	$prefixes:      ("-webkit", "-moz", "-ms", "-o",  "");
  @each $prefix in $prefixes {
    #{$prefix}-border-radius: $radius;
  }

  border-radius: $radius;
}