Can we detect if the ActiveX Control or Java Applet is installed?

<script type="text/javascript">
function  getActiveXInstalled () {
  /// <summary>Verifies whether ActiveX control is installed. If yes, it returns true; otherwise it returns false.</summary>
  /// <returns type="Boolean" />
  var progId = $au.uploader("imageUploader").activeXControl().progId();
  if (progId) {
    try {
      var a = new ActiveXObject(progId);
      return true;
    }
    catch (e) {
      return false;
    }
  }
  return false;
}
</script>

Then call this method like in this string:
var testvalue_1 = getActiveXInstalled();
alert(testvalue_1); //returns true or false

// -2 - Java not installed or not enabled
    // -1 - Installed Java version is less than required
    //  0 - Unable determine java
    //  1 - Required java version available
    function getJREInstalled () {
        var result = -2;
        if (navigator.javaEnabled()) {
            var ver = IUCommon.javaDetector.getJREs();
            if (ver == null) {
                //we can't get information about java in this browser
                result = 0;
            } else if (ver.length > 0) {
                //java installed and we have its version
                result = -1;
                for (var i = 0, maxi = ver.length; i < maxi; i++) {
                    if (IUCommon.javaDetector.compareVersions(ver[i], this.javaVersionRequired)) {
                        result = 1;
                        break;
                    }
                }
            }
        }
        return result;
    }