*{
font-family:Arial, Helvetica, sans-serif;
font-size:12px;
}
#fullbg{
background-color: Gray;
display:none;
z-index:3;
position:absolute;
left:0px;
top:0px;
filter:Alpha(Opacity=30);
-moz-opacity:0.4;
opacity: 0.4;
}
#dialog {
position:absolute;
width:200px;
height:200px;
background:#F00;
display: none;
z-index: 5;
}
#main {
height: 1500px;
}
点击这里看JS遮罩层效果
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