mp3 player in '95 S

i have a '95 S420. equipped for CD, but no changer installed. bought a palm
pilot (Tungsten E2) with RealPlayer built in. since i'm virtually certain
nobody makes a cable and adapter to connect the palm to the radio, i was
thinking that i could 'borrow' the car's speakers by connectng the palm to
them via the headphone jack. not sure if the output would be high enough to
power the car's speakers, though. any ideas how i could 'borrow' the radio's
amp, too?

Thanks in advance.