CC-4393: Please ignore Flac items for Playlist Preview and disable to preview it as a single track

-detect flash fallback

airtime_mvc/public/js/airtime/common/audioplaytest.js

@@ -9,5 +9,10 @@ function isAudioSupported(mime){
         bMime = mime;
     }
 
-    return !!bMime && !!audio.canPlayType && audio.canPlayType(bMime) != "";
+    //return a true of the browser can play this file natively, or if the
+    //file is an mp3 and flash is installed (jPlayer will fall back to flash to play mp3s).
+    //Note that checking the navigator.mimeTypes value does not work for IE7, but the alternative
+    //is adding a javascript library to do the work for you, which seems like overkill....
+    return (!!audio.canPlayType && audio.canPlayType(bMime) != "") || 
+        (mime.indexOf("mp3") != -1 && navigator.mimeTypes ["application/x-shockwave-flash"] != undefined);
 }