So basically everyone this is how it works...

He found where the cd player connects to the radio left and right wires. You disconnect the connection and run the output of the cd player to the input of a switch (one that has 2 inputs / 1 output stereo...(Double Pole Double Throw)) . and the other input of the switch goes to the mp-3/aux in.

The Output of the switch goes back to where you disconnected the cdplayer originally (into the radio). Clear enough???