CSS Mask Layer

<DivID= "Adbox"style= "Display:block;"> 　　 <Divclass= "Indxe-mask"></Div> 　　 <Divclass= "Index-ad-close"></Div> 　　 <Divclass= "Index-ad"> 　　　　 <ahref= "Http://www.cashlai.com/double11.do"Target= "_blank"><imgsrc= "Http://www.cashlai.com/activity/double11/images/index_pop.png"width= "848"Height= "456"></a> 　　 </Div></Div>

<style type= "Text/css" >
. Indxe-mask{width:100%;Height:100%;Background-color:#000;Opacity:0.5;-webkit-opacity:0.5;Filter:Alpha (OPACITY=50);-moz-opacity:0.5;position:fixed;Z-index:999;Top:0; Left:0;}. Index-ad{width:599px;Height:566px;position:Absolute;Top:20%; Left:50%;Margin-left:-300px;Z-index: +;}. Index-ad a{Display:Block;width:100%;Height:100%;}. Index-ad-close{position:Absolute;Top:22%; Left:50%;Margin-left:300px;background:URL (http://www.cashlai.com/static_content_30/img/zhongqiu_close.png) no-repeat;width:38px;Height:38px;Z-index:1001;cursor:Pointer;}
</style>

-webkit-opacity: Google Chrome Transparency

Filter:ie Transparency

-moz-opacity:firefox Transparency
0.5 is semi-transparent, 1 means opaque

Style of the. Indxe-mask Mask Layer

CSS Mask Layer