Dang, Clayneal, I didn't even realize that!
Sorry, Expatgirl, looks like you'll need to get an RCA audio cable after all!
And whatever minidisplay cable you get will fit into the Macbook because that's where the minidisplay port is. It's the OTHER end that goes into the TV that might need an adapter. If the minidisplay cable has a DVI plug on the other end, you'll need a DVI-to-HDMI adapter that snaps onto it in order to fit into the HDMI port on your TV. Hopefully though you can find a minidisplay-to-HDMI cable so that you won't need an adapter.