I am developing one application in html,css,javascript in phonegap. in that application i need a flash plugin coding for javascript to enable audio/video for my application
You would have to override the onCreate method in your Java class that extends DroidGap and put something like this in there:
WebSettings settings = appView.getSettings();
settings.setPluginState(PluginState.ON); // Turn Flash plugin on
Not exactly sure if this can be done in your class that extends DroidGap but it can definitely be done if you edit the DroidGap.java source!
Check out this link for details:
http://groups.google.com/group/phonegap/browse_thread/thread/b37c59f2ac532fe3/d5121817269e1ae1?lnk=gst&q=flash#d5121817269e1ae1