var W = screen.width;//取得屏幕分辨率宽度
        var H = screen.height;//取得屏幕分辨率高度
        function M(id)
        {
            return document.getElementById(id);//用M()方法代替document.getElementById(id)
        }
        //判断浏览器是否为IE
        function isIE()
        {
           return (document.all && window.ActiveXObject && !window.opera) ? true : false;
        }  
        function MC(t)
        {
            return document.createElement(t);//用MC()方法代替document.createElement(t)
        }               
        //让留言层显示为块 
        function showMessage()
        {
             var Message=M("Message");
             Message.style.display = "block";
        }
         //取得页面的高宽
         function getBodySize()
         {
            var bodySize = [];
            with(document.documentElement) 
            {
                bodySize[0] = (scrollWidth>clientWidth)?scrollWidth:clientWidth;//如果滚动条的宽度大于页面的宽度，取得滚动条的宽度，否则取页面宽度
                bodySize[1] = (scrollHeight>clientHeight)?scrollHeight:clientHeight;//如果滚动条的高度大于页面的高度，取得滚动条的高度，否则取高度
            }
            return bodySize;
         }
         //创建遮盖层
         function popCoverDiv()
         {
            if (M("cover_div")) 
            {
            //如果存在遮盖层，则让其显示 
             M("cover_div").style.display = 'block';
            } 
            else 
            {
                //否则创建遮盖层
                var coverDiv = MC('div');
                document.body.appendChild(coverDiv);
                coverDiv.id = 'cover_div';
                with(coverDiv.style) 
                {
                    position = 'absolute';
                    background = '#CCCCCC';
                    left = '0px';
                    top = '0px';
                    var bodySize = getBodySize();
                    width = bodySize[0] + 'px';
                    height = bodySize[1] + 'px';
                    zIndex = -100;
                    if (isIE()) 
                    {
                       filter = "Alpha(Opacity=60)";//IE逆境
                    } 
                    else 
                    {
                       opacity = 0.6;
                    }
                }
            }
        }                 
        //设置DIV层的样式
        function change()
        {
            var Message = M("Message");
             Message.style.position = "absolute";
             Message.style.border = "1px solid #CCCCCC";
             Message.style.background ="#F6F6F6";
           var i=0;
           var bodySize = getBodySize();  
           Message.style.left = (bodySize[0]-i*i*4)/2+"px";
           Message.style.top = (bodySize[1]/2-100-i*i)+"px";
           Message.style.width =    i*i*4 + "px";
           Message.style.height = i*i*2 + "px";
           popChange(i);      
        }
        //让DIV层大小循环增大
        function popChange(i){
           var Message = M("Message");
           var bodySize = getBodySize();
           Message.style.left = (bodySize[0]-i*i*4)/2+"px";
           Message.style.top = (bodySize[1]/2-100-i*i)+"px";
           Message.style.width =    i*i*4 + "px";
           Message.style.height = i*i*2+ "px";
           if(i<=10){
                  i++;
                  setTimeout("popChange("+i+")",10);//设置超时10毫秒
           }
        } 
        //打开DIV层
        function openg()
        {
        change();
        showMessage();
        popCoverDiv()
        void(0);//不进行任何操作,如：<a href="#">aaa</a>
        } 
        //关闭DIV层
        function closes(){
            M('Message').style.display = 'none';
            M("cover_div").style.display = 'none';
        void(0);
        }