Transparency Mixin SASS for All Browsers

Transparency Mixin
</>=opacity(!opacity)
</>opacity: !opacity
/* for All Good browsers */

</>-moz-opacity: !opacity
/* for Mozilla & Netscape */

</>-khtml-opacity: !opacity
/* for Safari & Webkit */

</>-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=" + round(!opacity100) + ")"
/ for IE 8*/

</>filter: "alpha(opacity=" + round(!opacity100) + ")"
/ for IE 5-7 */