/**
 * @class Ext.air.Sound
 * 
 * @singleton
 */
Ext.air.Sound = {
        
/**
         * Play a sound.
         * @param {String} file The file to be played. The path is resolved against applicationDirectory
         * @param {Number} startAt (optional) A time in the sound file to skip to before playing 
         */
        play : function(file, startAt){
                var soundFile = air.File.applicationDirectory.resolvePath(file);
                var sound = new air.Sound();
                sound.load(new air.URLRequest(soundFile.url));
                sound.play(startAt);
        }
};