居中置顶层+模糊效果（转）

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Microsoft ASP Gmail XHTML Blog

It's really cool,i like it.

<!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" xml:lang="zh-CN" lang="zh-CN">
	<head>
		<meta name="verify-v1" content="P4T6fFCiPVxqMWZ2eztyXVzMHlnwD0wLQOq6LBHN5Y8=" />
		<title>
			政策文件_中国电力工程造价信息网</title>
		<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
		<meta http-equiv="Content-Language" content="gb2312" />
		<meta name="KeyWords" content="电力工程造价,价格信息,装材,设备,电力工程" />
		<meta name="description" content="电力工程造价信息" />
		<style type="text/css">
		    *{
		        margin:0;padding:0;
		    }
		</style>
	</head>
	<body>
	

	<div class="cecmbody" id="cecmpolicy">
		<div class="leftClass">
            
<p>测试</p><p>测试</p>
			<p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p>
			<p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p>

			<input type="button" value="点击这里" onclick="sAlert('测试效果');" />
		

		</div>
		<div class="rightClass">
		</div>	
	</div>
				<script type="text/javascript" language="javascript">

//Author:Daviv
//Blog:http://blog.163.com/jxdawei
//Date:2006-10-27
//Email:jxdawei@gmail.com

			function sAlert(str){
			var msgw,msgh,bordercolor;
			msgw=400;//提示窗口的宽度
			msgh=100;//提示窗口的高度
			titleheight=25 //提示窗口标题高度
			bordercolor="#336699";//提示窗口的边框颜色
			titlecolor="#99CCFF";//提示窗口的标题颜色
			
			var sWidth,sHeight;
			sWidth=document.body.offsetWidth;
			sHeight=screen.height;

			var bgObj=document.createElement("div");
			bgObj.setAttribute('id','bgDiv');
			bgObj.style.position="absolute";
			bgObj.style.top="0";
			bgObj.style.background="#777";
			bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";
			bgObj.style.opacity="0.6";
			bgObj.style.left="0";
			bgObj.style.width=sWidth + "px";
			bgObj.style.height=sHeight + "px";
			bgObj.style.zIndex = "10000";
			document.body.appendChild(bgObj);
			
			var msgObj=document.createElement("div")
			msgObj.setAttribute("id","msgDiv");
			msgObj.setAttribute("align","center");
			msgObj.style.background="white";
			msgObj.style.border="1px solid " + bordercolor;
	    	msgObj.style.position = "absolute";
            msgObj.style.left = "50%";
            msgObj.style.top = "50%";
            msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
            msgObj.style.marginLeft = "-225px" ;
            msgObj.style.marginTop = -75+document.documentElement.scrollTop+"px";
            msgObj.style.width = msgw + "px";
            msgObj.style.height =msgh + "px";
            msgObj.style.textAlign = "center";
            msgObj.style.lineHeight ="25px";
            msgObj.style.zIndex = "10001";
   
		   var title=document.createElement("h4");
		   title.setAttribute("id","msgTitle");
		   title.setAttribute("align","right");
		   title.style.margin="0";
		   title.style.padding="3px";
		   title.style.background=bordercolor;
		   title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";
		   title.style.opacity="0.75";
		   title.style.border="1px solid " + bordercolor;
		   title.style.height="18px";
		   title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif";
		   title.style.color="white";
		   title.style.cursor="pointer";
		   title.innerHTML="关闭";
		   title.onclick=function(){
		        document.body.removeChild(bgObj);
                document.getElementById("msgDiv").removeChild(title);
                document.body.removeChild(msgObj);
                }
		   document.body.appendChild(msgObj);
		   document.getElementById("msgDiv").appendChild(title);
		   var txt=document.createElement("p");
		   txt.style.margin="1em 0"
		   txt.setAttribute("id","msgTxt");
		   txt.innerHTML=str;
           document.getElementById("msgDiv").appendChild(txt);
            }
		</script>
	</body>
</html>

原出处见：http://www.iamdcboy.com/article.asp?id=329

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