DetectAirInstall.as

package {
import flash.display.Loader;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.IOErrorEvent;
import flash.external.ExternalInterface;
import flash.net.URLRequest;
import flash.system.ApplicationDomain;
import flash.system.LoaderContext;


public class DetectAirInstall extends Sprite {
    var airSWF:Object; // This will be the reference to the main class of air.swf

    public function DetectAirInstall() {
        loadAirSWF();
    }

    public function loadAirSWF():void {
        var airSWFLoader:Loader = new Loader(); // Used to load the SWF
        var loaderContext:LoaderContext = new LoaderContext();
        // Used to set the application domain domain
        loaderContext.applicationDomain = ApplicationDomain.currentDomain;

        airSWFLoader.contentLoaderInfo.addEventListener(Event.INIT, onAirSWFInit);
        airSWFLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, onIoError);
        airSWFLoader.load(new URLRequest("http://airdownload.adobe.com/air/browserapi/air.swf"),
                loaderContext);
    }

    function onAirSWFInit(e:Event):void {
        airSWF = e.target.content;

        var status:String = airSWF.getStatus();
        ExternalInterface.call("detectAirStatus", status);
    }

    function onIoError(e:IOErrorEvent):void{
        reportError(e.text);
    }

    function reportError(message:String){
        ExternalInterface.call("detectAirStatus", "error", message);
    }
}
}