关闭窗口 不弹出提示

<script language="javascript" type="text/javascript">
function closeWindow() {
var ua = navigator.userAgent
var ie = navigator.appName == "Microsoft Internet Explorer" ? true : false
if (ie) {
var IEversion = parseFloat(ua.substring(ua.indexOf("MSIE ") + 5, ua.indexOf(";", ua.indexOf("MSIE "))))
if (IEversion < 5.5) {
var str = '<object id=noTipClose classid="clsid:ADB880A6-D8FF-11CF-9377-00AA003B7A11">'
str += '<param name="Command" value="Close"></object>';
document.body.insertAdjacentHTML("beforeEnd", str);
document.all.noTipClose.Click();
}
else {
parent.window.opener = null;
parent.window.open('', '_self', ''); //for IE7
parent.window.close();
}
}
else {
parent.window.close()
}
}
</script>