Can't change style at runtime

I try to change the backgroundImage of a canvas
     private function butClickHandler(event:MouseEvent):void
                    /* invalidly */
          styleCanvas.setStyle("backgroundImage", "@Embed('bird.png')");
              // styleCanvas.setStyle("backgroundImage", "Embed('bird.png')");
              // styleCanvas.setStyle("background-Image", "@Embed('bird.png')");
               // styleCanvas.setStyle("background-Image", "@Embed(source='bird.png')");
                    /* normally */
          styleCanvas.setStyle("backgroundColor", "#777777");
          Button(event.target).setStyle("fontSize", 22);
        <mx:Button x="38" y="44" label="为中国喝彩" click="butClickHandler(event)"/>
     <mx:Canvas id="styleCanvas" width="80" height="80">
          <mx:Label text="I'm Label"/>
     </mx:Canvas>

You need double-quotes:
styleCanvas.setStyle("backgroundImage", @Embed('bird.png'));
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