My dad and I got the Linksys wireless router and a USB NAC for my computer.

There is one thing that the installation instructions neglect to tell us:

What kind of ethernet cables do we use?

Right now we have a cable from the cable modem to a card on my dad's PC. What kind is that? We have that cable and a crossover, but I don't know if a crossover is the kind we need.

So basically, we need two cables, we have two cables, but we're not sure if we have the right cables. Any help?