@mixin shdw($val) {
  -webkit-box-shadow: 0 0 7px 0 rgba(0, 0, 0, $val);
  -moz-box-shadow: 0 0 7px 0 rgba(0, 0, 0, $val);
  box-shadow: 0 0 7px 0 rgba(0, 0, 0, $val);
  /* For IE 8 */
  -ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=$val, Direction=135, Color='#000000')";
  /* For IE 5.5 - 7 */
  filter: progid:DXImageTransform.Microsoft.Shadow(Strength=$val, Direction=135, Color='#000000');
}

@mixin opacity($val) {
  -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=$val)";
  filter: alpha(opacity=$val);
  -moz-opacity:$val;
  -khtml-opacity: $val;
  opacity: $val;
}