Ipod FM transmitter won't work!

[evankotsonis]

I'm trying to play my Ipod in my '99 Cavalier. I have one of those FM transmitters that has both the charger and the 3.5mm jack. When I plug both of them into my Ipod it starts charging, but it will not play on any FM or AM station. It's frustrating because I know it's connected because it starts charging, but I can't get it to play. The car doesn't have a cassette player so that is not an option. Anyone have some suggestions?