js 判断当前浏览器的flash player 是否安装及版本

function DownLoadFlashPlayer(){
    var swf;
    var flashVersion;
    if(jQuery.browser.msie){
        swf  =  new  ActiveXObject('ShockwaveFlash.ShockwaveFlash');  
        flashVersion=parseInt(swf.GetVariable("$version").split(" ")[1].split(",")[0]);
    }
    else{
        swf=navigator.plugins["Shockwave Flash"]; 
        if(swf){
            var words=swf.description.split(" ");
            for(var i=0;i<words.length;i++){
                if(isNaN(parseInt(words[i]))) continue;
                flashVersion=parseInt(words[i]);
            }
        }
    }
    if(!swf || flashVersion<12){
       var pageHost = ((document.location.protocol == "https:") ? "https://" :    "http://"); 
        document.write("<a href='http://get.adobe.com/cn/flashplayer/download/'><img src='" 
                        + pageHost + "www.adobe.com/images/shared/download_buttons/get_flash_player.gif' alt='Get Adobe Flash player' /></a>" ); 
    }
}