如何用js检查浏览器是否安装flash插件

<script type="text/javascript" language="JavaScript">
    //Powered By smvv @hi.baidu.com/smvv21
    function flashChecker() {
        var hasFlash = 0;         //是否安装了flash
        var flashVersion = 0; //flash版本
        var isIE = /*@cc_on!@*/0;      //是否IE浏览器  

        if (isIE) {
            var swf = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
            if (swf) {
                hasFlash = 1;
                VSwf = swf.GetVariable("$version");
                flashVersion = parseInt(VSwf.split(" ")[1].split(",")[0]);
            }
        } else {
            if (navigator.plugins && navigator.plugins.length > 0) {
                var swf = navigator.plugins["Shockwave Flash"];
                if (swf) {
                    hasFlash = 1;
                    var words = swf.description.split(" ");
                    for (var i = 0; i < words.length; ++i) {
                        if (isNaN(parseInt(words[i]))) continue;
                        flashVersion = parseInt(words[i]);
                    }
                }
            }
        }
        return { f: hasFlash, v: flashVersion };
    }  

    var fls = flashChecker();
    var s = "";
    if (fls.f) document.write("您安装了flash,当前flash版本为: " + fls.v + ".x");
    else document.write("您没有安装flash");
</script>