无提示关闭页面

function CloseWin(){
     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 = '';
     document.body.insertAdjacentHTML("beforeEnd", str);
     document.all.noTipClose.Click();
    } else {
     window.opener =null; window.close();
    }
   }else{
   window.close()
   }
}