function BOX_show(e)//显示
{ 
    if(document.getElementById(e)==null)
    {
        return ;
    }
    var selects = document.getElementsByTagName('select');
    for(i = 0; i < selects.length; i++) 
    { 
        selects[i].style.visibility = "hidden"; 
    } 

    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
	document.onkeyup = function(event)
	{
		var evt = window.event || event;
		var code = evt.keyCode?evt.keyCode : evt.which;
		//alert(code);
		
		if(code == 27)
		{
			BOX_remove(e);
		}	
	}
	
}

function BOX_remove(e)//移除
{ 
    window.onscroll = null;
    window.onresize = null;
    document.getElementById('BOX_overlay').style.display="none";
    document.getElementById(e).style.display="none";
    
    var selects = document.getElementsByTagName('select');
    for(i = 0; i < selects.length; i++) 
    { 
        selects[i].style.visibility = "visible"; 
    } 
}

function BOX_layout(e)//调整位置
{ 
    var a = document.getElementById(e);

    if (document.getElementById('BOX_overlay')==null)//判断是否新建遮掩层
    {
     
        var overlay = document.createElement("div");
        overlay.setAttribute('id','BOX_overlay');
		
        //overlay.onclick=function(){BOX_remove(e);};
        //a.parentNode.appendChild(overlay);
		document.body.appendChild(overlay);
    }
	
	document.getElementById('BOX_overlay').ondblclick=function(){BOX_remove(e);};
    //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;
    if (window.innerWidth) 
    {
        clientWidth = window.innerWidth;
       // clientWidth = ((Sys.Browser.agent === Sys.Browser.Safari) ? window.innerWidth : Math.min(window.innerWidth, document.documentElement.clientWidth));
    } 
    else 
    {
        clientWidth = document.documentElement.clientWidth;
    }
    
    var clientHeight;
    if (window.innerHeight) 
    {
        clientHeight = window.innerHeight;
        //clientHeight = ((Sys.Browser.agent === Sys.Browser.Safari) ? window.innerHeight : Math.min(window.innerHeight, document.documentElement.clientHeight));
    } 
    else 
    {
        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=999;
    a.style.display="";
    //a.style.left = scrollLeft+((clientWidth-a.offsetWidth)/2)+'px';
    //a.style.top = scrollTop+((clientHeight-a.offsetHeight)/2)+'px';
}

function HiddenButton(e)
{
    e.style.visibility='hidden';
    e.previousSibling.style.visibility='visible'
}



