How to connect laptop to CD decks and use mp3 files on the decks?

Hi, I plan on buying a laptop and hooking it up to 2 CD decks and I want to assign songs from the laptop onto the decks so I don't have to carry around cds and then use my mixer to mix the tracks together. I'd like to use the decks features to manipulate and control the songs just like I would if I was using cds, but instead using a laptop but don't know how to do this. What sort of equipment/software do I need to do this? Do I need CD decks that have a certain feature? Or is there a better/cheeaper way to do this?

thanks