javascript判断浏览器类型[zz]

<SCRIPT LANGUAGE="JavaScript">
  <!--
    function detectBrowser()//Writed by zhong1806#gmail.com at 2007-8-9 15:14:25
    {    
        var sAgent = navigator.userAgent.toLowerCase();
        this.isIE = (sAgent.indexOf("msie")!=-1); //IE6.0-7
        this.isFF = (sAgent.indexOf("firefox")!=-1);//firefox
        this.isSa = (sAgent.indexOf("safari")!=-1);//safari
        this.isOp = (sAgent.indexOf("opera")!=-1);//opera
        this.isNN = (sAgent.indexOf("netscape")!=-1);//netscape
        this.isMa = this.isIE;//marthon
        this.isOther = (!this.isIE && !this.isFF && !this.isSa && !this.isOp && !this.isNN && !this.isSa);//unknown Browser
    }
    var oBrowser = new detectBrowser();
    alert("IE:" + oBrowser.isIE + "/nfirefox:" + oBrowser.isFF + "/nsafari:" + oBrowser.isSa + "/nopera:" + oBrowser.isOp + "/nnetscape:" + oBrowser.isNN + "/nmarthon:" + oBrowser.isMa + "/nother browser:" + oBrowser.isOther);
  //-->
  </SCRIPT>