透明度hack

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browsers */       -webkit-opacity: 0.5;       /* netscape and Older than Firefox 0.9 */       -moz-opacity: 0.5;       /* Safari 1.x (pre WebKit!) 老式khtml内核的Safari浏览器*/       -khtml-opacity: 0.5;       /* IE9 + etc...modern browsers */       opacity: .5;       /* IE 4-9 */       filter:alpha(opacity=50);       /*This works in IE 8 & 9 too*/       -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";       /*IE4-IE9*/       filter:progid:DXImageTransform.Microsoft.Alpha(Opacity=50);