实现body背景拉伸自适应 兼容chrome ie7,8,9.ie6未测试

        html, body
        {
/*此部分支持chrome，应该也支持firefox*/
            background: rgb(246,248,249);
            background: url('/styles/images/bg.jpg') no-repeat center fixed;
            background-attachment: fixed;
            background-size: 100% 100%;
/*以下是IE部分，使用滤镜*/
            filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/styles/images/bg.jpg',sizingMethod='scale');
            background-repeat: no-repeat;
            background-positon: 100%, 100%;
            font: normal 12px tahoma, arial, verdana, sans-serif;
            margin: 0;
            padding: 0;
            border: 0 none;
            overflow: hidden;
            height: 100%;
        }