Custom border radius mixin for Compass

gistfile1.scss

// Custom Border Radius
@mixin _border-radius($radius: 5px, $vertical-radius: false) {

	@if $vertical-radius {
		// Webkit doesn't understand the official shorthand syntax for specifying
		// a vertical radius unless so in case there's several we only take the first.
		@include experimental(border-radius, first-value-of($radius) first-value-of($vertical-radius),
			not -moz,
			-webkit,
			not -o,
			not -ms,
			not -khtml,
			not official
		);
		@include experimental(border-radius, $radius unquote("/") $vertical-radius,
			-moz,
			not -webkit,
			not -o,
			not -ms,
			not -khtml,
			official
		);
 	} @else {
		@include experimental(border-radius, $radius,
			-moz,
			-webkit,
			not -o,
			not -ms,
			not -khtml,
			official
		);
	}
}