====== CSS Opacity 투명도 ======
  * [[http://www.quirksmode.org/css/opacity.html|Quirksmode Opacity]]

<code css>
.opaque {
  -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=50)"; // first! IE 8
  filter: alpha(opacity=50);					// second! IE 5-7
  opacity: .5; // Others
}
</code>