Connecting with 2 Routers and wiring issue

I am connected to the internet with a Linksys WRT54GS Router. I have a
computer in the basement that I'm trying to connect to this router via
another Linksys router. The basement router is connected to the primary
router by using one of its 4 ports and connecting to the basement router's
input port. I'm making the connection by using an existing Cat 5 cable in
the wall, and connecting pairs 2 and 3 to a network jack. Assuming that the
two routers should talk to each other in the manner that I'm trying to
connect them, the problem seems to be in the connectivity of the Cat 5 cable
to the wall jacks.

It is my understanding that I only need to use pairs 2 and 3 in my Cat 5
cable, which is using pair 1 for the telephone line. Under that assumption,
I just connected the orange and green wires. The confusing part was the
block on the back of the RJ45 port on the wall plate. There are 4 sets of
connections -- red/green, yellow/black, brown/orange, and white and blue.
It seems that the pairs in the cable and the pairs on the jack don't match
up. The two pairs in the cable use pins 1,2,3, and 6. Pins 1,2,3, and 6 on
the jack are the blue, orange, black, and yellow wires. The black and
yellow wires correspond with pair 2 on the jack, but the blue and orange
wires correspond with pairs 3 and 4. If I were to use pair 3 on the jack
(orange and brown wires), then it seems that the pins (3 and 6) on the cable
and jack won't match up to each other. Am I wrong about this? If so, can
anyone point me in the right direction? For something that seems like it
should be simple, it's making me scratch my head a lot.