<script>
function close1(){    
        closes.Click();                  //ie4
}
function close2(){
        window.opener=null;       //ie5.5
        window.close();
}
</script>
<input type="button" value="关闭" onclick="close1()">
<input type="button" value="关闭" onclick="close2()">
<object id="closes" classid="clsid:adb880a6-d8ff-11cf-9377-00aa003b7a11"> 
<param name="Command" value="Close"> 
</object>