/*为显示div*/
 .mask {   
            color:#C7EDCC;
            background-color:#FFF;
            position:absolute;
            top:0px;
            left:0px;
            filter: Alpha(Opacity=60);
        } 
.pop-box {   
            z-index: 9999; /*这个数值要足够大，才能够显示在最上层*/  
            display: none;   
            position: absolute;   
            background-color:#FFF;
        }   
.hide { 
            display: none;   
        }