Making my MP3 play on the radio?

my dad wants a mp3 player and he doesnt have a cassette or cd in his van for work. I know that there is something u can attach to an mp3 that you can run in through the radio by tunning in the station what is that called and where can i get it?

thanks

Making my MP3 play on the radio?custom myspace

You'll need an FM transmitter. Which kind of transmitter would depend on the mp3 player you have. If you have an IPod than the Griffin would work fine.

Making my MP3 play on the radio?myspace ip myspace.com

yeah Just google/or Yahoo search, Griffin FM and you'll find it.