关闭父页面和子页面的问题

点击页面super.htm的一个按钮,弹出一个新页child.htm(spuer.htm没有被关闭)

要求关闭super.htm时,弹出对话框询问“是否关闭?”.

如果同意,关闭super.htm,同时关闭child.htm

是否在super.htm用

function window.onbeforeunload()
{

window.event.returnValue="确定要退出本页吗?";
}
请各位赐教
---------------------------------------------------------------

1<input onclick="meizz=window.open('ttt.htm')" type="button" value="ok"/>
 1<script language="JavaScript"><!--   
 2function window.onbeforeunload()   
 3{   
 4window.event.returnValue="";   
 5}   
 6function window.onunload()   
 7{   
 8if (typeof(meizz)!="undefined" && meizz.open && !meizz.closed)   
 9meizz.close();   
10}   
11//--></script>
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