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用DIV模拟弹出窗口－－窗体滚动跟随

<!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>丁学-博客园-http://www.cnblogs.com/dingxue</title>
<script>
function getPosition() {
      var top    = document.documentElement.scrollTop;
      var left   = document.documentElement.scrollLeft;
      var height = document.documentElement.clientHeight;
      var width  = document.documentElement.clientWidth;
      return {top:top,left:left,height:height,width:width};
}

function showPop(){
	var width  = 300;  //弹出框的宽度
	var height = 160;  //弹出框的高度
	var obj    = document.getElementById("pop");
	
	obj.style.display  = "block";
	obj.style.position = "absolute";
	obj.style.zindex   = "999";
	obj.style.width    = width + "px";
	obj.style.height   = height + "px";
	
	var Position = getPosition();
	leftadd = (Position.width-width)/2;
	topadd  = (Position.height-height)/2;
	obj.style.top  = (Position.top  + topadd)  + "px";
	obj.style.left = (Position.left + leftadd) + "px";
	
	window.onscroll = function (){
		var Position   = getPosition();
		obj.style.top  = (Position.top  + topadd)  +"px";
		obj.style.left = (Position.left + leftadd) +"px";
	};
}

function hidePop(){
	document.getElementById("pop").style.display = "none";
}
</script>
</head>
<body>
丁学－－博客园－－http://www.cnblogs.com/dingxue
<div id="pop" style="border:1px solid #CCC;display:none;">test<br><a href="javascript:hidePop();" target="_blank" rel="external nofollow"  target="_blank" rel="external nofollow"  mce_href="javascript:hidePop();" target="_blank" rel="external nofollow"  target="_blank" rel="external nofollow" >hide</a></div>
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<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
<a href="javascript:showPop()" target="_blank" rel="external nofollow"  target="_blank" rel="external nofollow"  mce_href="javascript:showPop()" target="_blank" rel="external nofollow"  target="_blank" rel="external nofollow" >show</a>
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</body>
</html>
javascript div function xhtml html border
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