I've a 99 Chevy Cavalier, with the factory default radio/CD Player. It's got an 'aux' function button, so I'm wondering if it's actually got audio inputs (be it 1/8th inch 'headphone' style jack, or l/r RCA style) to plug me MP3 player in. Anybody have any idea? And if so, suggestions on the best way to get to them? Thanks!