一个Javascript遮罩层和窗口

JQuery也有很多这样的插件，觉得这个也不错

<!DOCTYPE html PUBLIC "-W3CDTD XHTML 1.0 TransitionalEN" "http:www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>无标题页</title>
    <script type="text/javascript">
    function sAlert(str){
   var msgw,msgh,bordercolor;
   msgw=550;//Width
   msgh=265;//Height
   titleheight=25 //title Height;
   bordercolor="#336699";//boder color
   titlecolor="#99CCFF";//title color
   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="关闭窗口";
   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>
</head>
<body>
    <div onclick="sAlert('谁让你点我的!');">点我点我点我点我点我点我点我</div>
    <input id="Text1" type="text" />
</body>
</html>