For fading audio, I am not sure, I have never done it. Maybe just create a while() loop and slowly lower the volume?

For fading an image to black. I think you just create one panel with a black bmap and another on top of it (the one which you will later fade). Then you simply lower the alpha value of the panel on top to slowly reveal the panel on the bottom. Not tested though ^^

Thanks,
Adoado