Ok I didn't want to start a new thread because I wasn't sure I understand this one right

. but... here goes....
Is it possible to have two wireless routers connected to each other? I'll explain; The modem is in the upstairs of the house connected to a Linksys wireless router, not sure which model #. Is it possible to have my D-link DI-524 connect to it wirelessly which will be in the downstairs of the house in an apartment? So that I could use the 4 hardwired ports for the computers and PS2 that will be down there?
And if I understood this thread right; it is possible I just have to get a wireless card for one of the PC's? Or would I even be able to use a laptop that has a wireless card and hardwire port?
Help lol I'm so confused hehe

Any help would be great ^^
Thank you ;)