javascript 检测RealPlayer是否安装

function RealplayerTest()
{
    /* 测试当前系统中是否支持RealPlayer播放
    // 返回值: true------支持RealPlayer
    // false-----不支持RealPlayer
    //*/
    var RealMode=0;
    var RealG2=0;
    var Real5=0;
    var Real4=0;
    if (navigator.userAgent.indexOf("MSIE")< 0 )
    { //对非IE的处理
        var numPlugins = navigator.plugins.length;
        for (var i = 0; i < numPlugins; i++)
        {
            plugin = navigator.plugins[i];
            if (plugin.name.substring(0,10)=="RealPlayer")
            {
                RealMode=1;
            }
        }
    }else{ //对IE内核浏览器的处理
        try {
            var realtmp=new ActiveXObject("rmocx.RealPlayer G2 Control");
            if (realtmp)
            {
                RealG2=1;
            }
        }catch(e){
            RealG2=0;
        }
        try {
            var realtmp=new ActiveXObject("RealPlayer.RealPlayer(tm) ActiveX Control (32-bit)");
            if (realtmp)
            {
                Real5=1;
            }
        }catch(e){
            Real5=0;
        }
        try {
            var realtmp=new ActiveXObject("RealVideo.RealVideo(tm) ActiveX Control (32-bit)");
            if (realtmp)
            {
                Real4=1;
            }
        }catch(e){
            Real4=0;
        }
        if (RealG2|Real5|Real4)
        {
            RealMode=1;
        }
    }
    
    if ( RealMode )
    {
        return true;
    }else{
        return false;
    }
}