自动关闭的弹出框(alert)

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>

<BODY>
 <INPUT TYPE="button" NAME="" onclick="alert('看到效果没有啊,我将消失',);" value="Test">
</BODY>
</HTML>
<SCRIPT LANGUAGE="JavaScript">
<!--
   function autoCloseAlert(msg)
   {
      var tempFrm=document.getElementById("msgFrm");
   if(tempFrm==null||typeof(tempFrm)=="undefined")
   {
     tempFrm =document.createElement("iframe");
  document.body.appendChild(tempFrm);
  tempFrm.id = "msgFrm";  
     tempFrm.name ="msgFrm";
     tempFrm.style.display="none";
   }
   msg=msg.replace(/"/g,"///"");
   msg=msg.replace(//n/g,"//n");
   var sfeature="status:no;resizable:no;help:no;dialogHeight:height:30px;dialogHeight:40px;";
   msgFrm.showModelessDialog("javascript:alert(/""+msg+"/");window.close();","",sfeature);
   setTimeout("msgFrm.location.reload();",1500);
 }
    //重写弹出框
 var oldAlert = window.alert;
    window.alert = function(msg)
    {
      var tempEvent=window.event;
    if(tempEvent==null)
    {
       oldAlert(msg);
    }else
    {
       autoCloseAlert(msg);
    }
    }
  alert('还是以前那个');
//-->
</SCRIPT>