play a flv video, and if the video is missing or when i have error play another one in another location

hello,

First sorry for my english, i use to speak french, and i'm really new in flash so

here is my problem

i want to play a flv video locate in my hardisk

i'm using this

    var vid:Video;

    var nc:NetConnection = new NetConnection();

    nc.connect(null);

    var ns:NetStream = new NetStream(nc);

    ns.addEventListener(AsyncErrorEvent.ASYNC_ERROR, asyncErrorHandler);

    var customClient:Object = new Object();

    customClient.onMetaData = metaDataHandler;

    ns.client = customClient;

    ns.play("../docs/video1.flv");

    vid = new Video();

    vid.attachNetStream(ns);

    addChild(vid);

    function asyncErrorHandler(event:AsyncErrorEvent):void

    {

    trace(event.text);

    }

    function metaDataHandler(infoObject:Object):void {

    vid.width = infoObject.width;

    vid.height = infoObject.height;

    }

it's working with no problem.

but i want to add a condition in case the video can be play for any reason ( video is missing, wrong name, wrong format, any error...)

in this case i want flash to play another video locate in a other place

i hope is clear enough, and i hope someone can help me with that

thank you