Imperial88

I am expecting a new Dell Inspiron laptop sometime within the next month. In my car I have a Pioneer DEH-P8400MP cd player. I want to connect the two. After doing research online & on the phone (calling around), I was led to the conclusion that I need the Pioneer CD-RB10 (with no changers, no XM capablities). I believe that I need to connect a RCA red/white cable from my laptop headphone port to the CD-RB10 that connects to the back of my head unit. I Don't believe my unit has an AUX IN port on it. Can someone please confirm my findings or give any suggestions/advising. ALL comments are appreciated as I attempted to teach myself how to connect the two, thank you.