//显示
function BOX_show(e) 
{   
    if(document.getElementById(e)==null){return;}
    BOX_layout(e);
    window.onresize = function(){BOX_layout(e);} //改变窗体重新调整位置
    window.onscroll = function(){BOX_layout(e);} //滚动窗体重新调整位置
}

//移除
function BOX_remove(e)
{   
    document.getElementById('BOX_overlay').style.display="none";
    document.getElementById(e).style.display="none";
    
    window.onscroll = null;
    window.onresize = null;
}

//调整布局
function BOX_layout(e)
{ 
    var a = document.getElementById(e);
    
    //判断是否新建遮掩层
    if (document.getElementById('BOX_overlay')==null)
    { 
        var overlay = document.createElement("div");
        overlay.setAttribute('id','BOX_overlay');
        a.parentNode.appendChild(overlay);
    }
    
    //取客户端左上坐标，宽，高
    var scrollLeft = (document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft);
    var scrollTop = (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop);
    var clientWidth = document.documentElement.clientWidth;
    var clientHeight = document.documentElement.clientHeight;
  
    var bo = document.getElementById('BOX_overlay');
    bo.style.left = scrollLeft+'px';
    bo.style.top = scrollTop+'px';
    bo.style.width = clientWidth+'px';
    bo.style.height = clientHeight+'px';
    bo.style.display="";
    //Popup窗口定位
    a.style.position = 'absolute';
    a.style.zIndex=1000001;
    a.style.display="";
    a.style.margin = "auto";
    a.style.width = "100%";
    a.style.left = 0;
    a.style.top = "300px";
    document.getElementById('setting').style.display="block";
}