css loading 效果

.loading{

width:160px;

height:56px;

position: absolute;

top:50%;

left:50%;

line-height:56px;

color:#fff;

padding-left:60px;

font-size:15px;

background: #000 url(images/loader.gif) no-repeat 10px 50%;

opacity: 0.7;

z-index:9999;

-moz-border-radius:20px;

-webkit-border-radius:20px;

border-radius:20px;

filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);

}

<div id="loading" class="loading">Loading pages...</div>

//遮罩层,

.loading{

    position: fixed;

    top: 0px;

    left: 0px;

    right:0px;

    bottom:0px;

    background-color: #8FB0D1;

    -moz-opacity: 0.5;

    opacity:0.5;

    z-index:1001;

    filter: alpha(opacity=40);
    padding-top: 20%;
}