Js弹出层,可拖拽,可关闭

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>弹出层并可拖拽</title>
<style>
html,body{height:100%;overflow:hidden;}
body,div,h2{margin:0;padding:0;}
body{font:12px/1.5 Tahoma;}
center{padding-top:10px;}
button{cursor:pointer;}
#overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#000;opacity:0.5;filter:alpha(opacity=50);display:none;}
#win{position:absolute;top:50%;left:50%;width:400px;height:200px;background:#fff;border:4px solid #f90;margin:-102px 0 0 -202px;display:none;}
h2{font-size:12px;height:18px;text-align:right;background:#FC0;border-bottom:3px solid #f90;padding:5px;cursor:move;}
h2 span{color:#f90;cursor:pointer;background:#fff;border:1px solid #f90;padding:0 2px;}
</style>
<script>
window.onload = function ()
{
	var oWin = document.getElementById("win");
	var oLay = document.getElementById("overlay");	
	var oBtn = document.getElementsByTagName("button")[0];
	var oClose = document.getElementById("close");
	var oH2 = oWin.getElementsByTagName("h2")[0];
	var bDrag = false;
	var disX = disY = 0;
	oBtn.onclick = function ()
	{
		oLay.style.display = "block";
		oWin.style.display = "block"	
	};
	oClose.onclick = function ()
	{
		oLay.style.display = "none";
		oWin.style.display = "none"
		
	};
	oClose.onmousedown = function (event)
	{
		(event || window.event).cancelBubble = true;
	};
	oH2.onmousedown = function (event)
	{		
		var event = event || window.event;
		bDrag = true;
		disX = event.clientX - oWin.offsetLeft;
		disY = event.clientY - oWin.offsetTop;		
		this.setCapture && this.setCapture();		
		return false
	};
	document.onmousemove = function (event)
	{
		if (!bDrag) return;
		var event = event || window.event;
		var iL = event.clientX - disX;
		var iT = event.clientY - disY;
		var maxL = document.documentElement.clientWidth - oWin.offsetWidth;
		var maxT = document.documentElement.clientHeight - oWin.offsetHeight;		
		iL = iL < 0 ? 0 : iL;
		iL = iL > maxL ? maxL : iL; 		
		iT = iT < 0 ? 0 : iT;
		iT = iT > maxT ? maxT : iT;
		
		oWin.style.marginTop = oWin.style.marginLeft = 0;
		oWin.style.left = iL + "px";
		oWin.style.top = iT + "px";		
		return false
	};
	document.onmouseup = window.onblur = oH2.onlosecapture = function ()
	{
		bDrag = false;				
		oH2.releaseCapture && oH2.releaseCapture();
	};
};
</script>
</head>
<body>
<div id="overlay"></div>
<div id="win"><h2><span id="close">×</span></h2></div>
<center><button>弹出层</button></center>
</body>
</html>