how to split an internet adsl connection to 2 computers?

[ZumbambueColaradzak]

I have 1 adsl internet connection and 2 computers. I can only connect to the internet with 1 computer each time. I use a wirelles linksys modem. Is it possible to connect to the internet with both computers simultaneously, preferably wireless? What equipment do I need (modem, router etc.), what are the necessary steps? thanks.
what I care most is to be able to use the internet to both computers simultaneously. thanks.