basic simple question - how to add input to a simple radio receiver

Folks

Sorry if its a basic question for some of you, here it is anyway:

I have a small simple radio device which consists of a knob for volume and has a button for scanning radio stations. Its powered by 3 AA batteries. It connects to a tiny speaker that is built-in.

I'd like to provide input to this radio device from an iPod. Few questions:

1. Is it possible to do this?
2. Have any of you had experience doing this? If so, how?

If you would like a picture of the circuit board, let me know.

Please respond to this post directly.

Thanks!

-R