JavaScriptでウィンドウを自動で閉じる方法

<script language="javascript">
<!--
function closewin()
{
self.opener=null;
self.close();
}
function clock()
{
i=i-1
document.title="本窗口将在" + i + "秒后自动关闭!";
if(i>0)setTimeout("clock();",1000);
else closewin();
}
var i=10
clock();
//-->
</script>

<script language=javascript>  
<!--  
this.window.opener = null;  
window.close();  
//-->  
</script>

function CloseWin() //这个不会提示是否关闭浏览器    
{    
window.opener=null;    
//window.opener=top;    
window.open("","_self");    
window.close();    
}

function open_complex_self() {    
  var obj_window = window.open('close.html', '_self');    
  obj_window.opener = window;    
  obj_window.focus();    
 }

window.close();

//普通带提示关闭
function closeie(){
window.close();
}
//关闭IE6不提示
function closeie6(){
window.opener=null;
window.close();
}
//关闭IE7不提示
function closeie7(){
window.open('','_top');
window.top.close();
}