function flash_allowed()
{
    var allowed_platforms = new Array("Win32", "Linux i686", "MacPPC", "MacIntel");
    var result = false;

    for (var i in allowed_platforms)
    {
        if (navigator.platform.indexOf(allowed_platforms[i]) > -1)
        {
            result = true;
            break;
        }
    }

    return result;
}