function checkInstall(){
    try
    {
        var o = new ActiveXObject('VSpeed.ExeCheck');
        var ret;
        o.StartVSpeedClient(ret);
        return true;    
    }
    catch(e)
    {
         window.showModalDialog('download_s.html', window, 'dialogwidth:662px;dialogheight:327px;help:0;center:yes;resizable:0;status:0;scroll:no');
    }
    return false;
}