// Next comes the standard javascript detection that uses the 
// navigator.plugins array. We pack the detector into a function so that 
// it preloads before being run.

function detectFlash() {  
  // If navigator.plugins exists...
  if (navigator.plugins) {
    // ...then check for flash 2 or flash 3+.
    if (navigator.plugins["Shockwave Flash 2.0"]
        || navigator.plugins["Shockwave Flash"]) {

      var isVersion2 = navigator.plugins["Shockwave Flash 2.0"] ? " 2.0" : "";
      var flashDescription = navigator.plugins["Shockwave Flash" + isVersion2].description;
      var flashVersion = parseInt(flashDescription.substring(16));

   
      flash2Installed = flashVersion == 2;    
      flash3Installed = flashVersion == 3;
      flash4Installed = flashVersion == 4;
      flash5Installed = flashVersion == 5;
      flash6Installed = flashVersion == 6;
      flash7Installed = flashVersion == 7;
      flash8Installed = flashVersion == 8;
      flash9Installed = flashVersion >= 9;
    }
  }
  
  // Loop through all versions we're checking, and
  // set actualVersion to highest detected version.
  for (var i = 2; i <= maxVersion; i++) {  
    if (eval("flash" + i + "Installed") == true) actualVersion = i;
  }
  
  // If we're on msntv (formerly webtv), the version supported is 4 (as of
  // January 1, 2004). Note that we don't bother sniffing varieties
  // of msntv. You could if you were sadistic...
  if(navigator.userAgent.indexOf("WebTV") != -1) actualVersion = 4;  
  
  // DEBUGGING: uncomment next line to display flash version
  // alert("version detected: " + actualVersion);


  // We're finished getting the version on all browsers that support detection.
  // Time to take the appropriate action.

  // If the user has a new enough version...
  if (actualVersion >= requiredVersion) {
    // ...then we'll redirect them to the flash page, unless we've
    // been told not to redirect.
    if (useRedirect) {
      // Need javascript1.1 to do location.replace
      if(jsVersion > 1.0) {
        // It's safe to use replace(). Good...we won't break the back button.
        window.location.replace(flashPage);  
      } else {
        // JavaScript version is too old, so use .location to load
        // the flash page.
        window.location = flashPage;
      }
    }
    
    // If we got here, we didn't redirect. So we make a note that we should
    // write out the object/embed tags later.
    hasRightVersion = true;                
  } else {  
    // The user doesn't have a new enough version.
    // If the redirection option is on, load the appropriate alternate page.
    if (useRedirect) {
      // Do the same .replace() call only if js1.1+ is available.
      if(jsVersion > 1.0) {
        window.location.replace((actualVersion >= 2) ? upgradePage : noFlashPage);
      } else {
        window.location = (actualVersion >= 2) ? upgradePage : noFlashPage;
      }
    }
  }
}

detectFlash();  // call our detector now that it's safely loaded.