《遮蔽层的隐藏块》

隐藏块样式及脚本：

#hidebg {

background-color: #ccc;

display: none;
filter: alpha(opacity=50);
-moz-opacity: 0.5;
-khtml-opacity: 0.5;
opacity: 0.5;
position: absolute;
left: 0;
top: 0;
width: 100%;
z-index: 3;

}

<div id="hidebg"></div>

<script>

 $(function(){

      show();

 });

 function show()  //显示隐藏层和弹出层

    {

        var hideobj = document.getElementById("hidebg");

        hidebg.style.display = "block";  //显示隐藏层

        hidebg.style.height = document.body.clientHeight + "px";  //设置隐藏层的高度为当前页面高度

        document.getElementById("shop_notice").style.display = "block";  //显示弹出层

    }

    function closed()  //去除隐藏层和弹出层

    {

        document.getElementById("hidebg").style.display = "none";

        document.getElementById("shop_notice").style.display = "none";

    }

</script>