function ShowNo()                        //闅愯棌涓や釜灞?
        {
            document.getElementById("divCave").style.display="none";
            document.getElementById("divOnCave").style.display="none";
        }
  function showCave(){
        var range = getRange();
            document.getElementById('divCave').style.width = range.width + "px";
            document.getElementById('divCave').style.height = range.height + "px";
            document.getElementById('divCave').style.display = "block";
            document.getElementById("divOnCave").style.display="";
    } 
        function showCenterFloat() //根据屏幕的大小显示两个层 
        { 
            var x,y;
            if(document.body.scrollTop){
              x=document.body.scrollLeft;
              y=document.body.scrollTop;
            }
            else{
              x=document.documentElement.scrollLeft;
              y=document.documentElement.scrollTop;
            }
              x=document.body.scrollLeft;
              y=document.documentElement.scrollTop;
          
            document.getElementById("divOnCave").style.marginTop=y-1480+"px";   //alert(a   +   y+"px");alert(y);

            document.getElementById("divOnCave").style.marginLeft= x-236+"px";
                    
        var range = getRange(); //alert(range.top+"+"+range.left+"+"+range.height+"+"+range.width);
        document.getElementById('divCave').style.width = range.width + "px"; 
        document.getElementById('divCave').style.height = range.height + "px"; 
        document.getElementById('divCave').style.display = "block"; 
        //document.getElementById("divLogin").style.marginTop=range.top+"px";
        document.getElementById("divOnCave").style.display="block"; 
       
        } 
         function HomeShowCenterFloat() //根据屏幕的大小显示两个层 
        { 
            var x,y;
            if(document.body.scrollTop){
              x=document.body.scrollLeft;
              y=document.body.scrollTop;
            }
            else{
              x=document.documentElement.scrollLeft;
              y=document.documentElement.scrollTop;
            }
              x=document.body.scrollLeft;
              y=document.documentElement.scrollTop;
          
            document.getElementById("divOnCave").style.marginTop=y-1080+"px";   //alert(a   +   y+"px");alert(y);

            document.getElementById("divOnCave").style.marginLeft= x-436+"px";
                    
        var range = getRange(); //alert(range.top+"+"+range.left+"+"+range.height+"+"+range.width);
        document.getElementById('divCave').style.width = range.width + "px"; 
        document.getElementById('divCave').style.height = range.height + "px"; 
        document.getElementById('divCave').style.display = "block"; 
        //document.getElementById("divLogin").style.marginTop=range.top+"px";
        document.getElementById("divOnCave").style.display="block"; 
       
        } 
        function getRange()                      //寰楀埌灞忓箷鐨勫ぇ灏?
        {
              var top     = document.body.scrollTop;
              var left    = document.body.scrollLeft;
              var height = document.body.clientHeight;
              var width   = document.body.clientWidth;

              if (top==0 && left==0 && height==0 && width==0) 
              {
                top     = document.documentElement.scrollTop;
                left    = document.documentElement.scrollLeft;
                height = document.documentElement.clientHeight;
                width   = document.documentElement.clientWidth;
              }
              return {top:top ,left:left ,height:height ,width:width } ;
        }