.css
.pay_div {
width: 100%;
position: absolute;
z-index: 999;
background-color: #FFFFFF;
list-style-type: none;
bottom: 0px;
display: none;
}
.zhegai {
width: 100%;
height: 100%;
background-color: #000;
filter: alpha(opacity=50);
-moz-opacity: 0.5;
opacity: 0.5;
position: absolute;
left: 0px;
top: 0px;
display: none;
z-index: 100;
}
html
<div id="Cover_layer" class="zhegai">
</div>
<div id="pay_div" class="pay_div">
</div>
