Simple Plugin for hide server streaming

Hi there,
what I need it's quite simple but I have no idea how to start... so, I'm here to ask for suggestions.

To hide the streamer name (rtmp://myserver/myapp) I would like to create a simple plugin to read one flash var and decide the server app.

Example:

flashvar: station=stationX

and this plugin may read

if(station == 'stationX'){

streamer = 'rtmp://stationX/appx';

}else if (station == 'stationY'){

streamer = 'rtmp://stationY/appY';

}

Well.. as I said.. it's quite simple.. I have only 5 stations that I need to hide on swf but have no idea how to start.