As Spiderz said ...
Though I have found that in a lot of cases even that is not necessary -- just try daisy chain the 2 together, i.e plug one normal cable from one hub to the other hub.
Hopefully it's switches and not routers, but that's a discussion for another thread, but even the el-cheapo Mecer switches I have, have enough autosensing to just make it work ...
I currently have a Billion modem plugged into a Mecer switch plugged into a Dlink switch connecting all the devices in my house -- all normal Cat5 cables, no cross-overs.