提示框自动关闭

function msg(strTitle,strContent){  
    var msgw,msgh,bordercolor;  
    msgw=300;//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="#99bbe8";//提示窗口的边框颜色  
    titlecolor="#99bbe8";//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.title = "点击关闭";  
    title.innerHTML="<table border='0′ width='100%'><tr><td align='left'>"+ strTitle +"</td></tr></table></div>";  
   setTimeout(
  
   function(){  
       document.body.removeChild(bgObj);  
       document.getElementById("msgDiv").removeChild(title);  
       document.body.removeChild(msgObj);  
       }
   ,2000);
         
    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=strContent;  
    document.getElementById("msgDiv").appendChild(txt);  
    function closewin() {      
    document.body.removeChild(document.getElementById("msgDiv"));    
  }    
}