One of these tiny details is checking that the browser can support the Flash plug-in and JavaScript interpreter. This means the browser must be Netscape 4+ with Java-enabled for Mac or Win, or IE 4+ for Windows: (winIEpass || NNpass). The boolean variable winIEpass is true when navigator.appName includes "Microsoft", navigator.appVersion includes "Windows", and navigator.appVersion is 4 or higher:

winIEpass = ((navigator.appName.indexOf("Microsoft") != -1) && 
  (navigator.appVersion.indexOf("Windows") != -1)) && 
  (parseFloat(navigator.appVersion) >= 4) ? true : false;

The boolean variable NNpass is true when navigator.appName includes "Netscape", navigator.userAgent includes "Mozilla", navigator.appVersion is 4 or higher, and navigator.javaEnabled is true:

NNpass = ((navigator.appName == "Netscape") && 
  (navigator.userAgent.indexOf("Mozilla") != -1) && 
  (parseFloat(navigator.appVersion) >= 3) && 
  (navigator.javaEnabled())) ? true : false;

One of the problems of plug-ins is that if the user does not have the right browser version or the latest plug-in version, he or she will receive an error message, a broken plug-in icon, or other warning. For Flash graphics, it is suggested to have a second non-Flash version of your Web page. A simpler solution is to embed the interactive audio if and only if the browser/plug-in combination can play it. If it cannot, the audio is disabled and no error messages are displayed. Also, there are no forced plug-in installs. End users will leave your page very quickly once they are being troubled with plug-in installs and error messages. Use the variables above to conditionally embed your sound tracks.

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