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IE7 IE8でopacity対応

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.transparent {
       -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
       filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=50);
       opacity: 0.5;
}

Microsoft CSS ベンダー拡張
http://msdn.microsoft.com/ja-jp/ie/dd218499.aspx

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