ISP Address with wireless

[mostsmooth]

hey
i discovered last night that i couldnt connect to the internet with my wireless laptop.
it tells me the ISP address couldnt be found, or something to that affect. the desktop connects fine (cable connection).
the linksys wireless seems to be connecting to the router, just cant get to the net.
what do i need to do? anybody? maybe im being too vague?
i hate working from the desktop!