Two wireless Router

I have one US Robotics wireless Router connect to the internet, Can I connect a Linksys wireless router to the other router wirelessly.

No, but keep reading.

A wireless router is a router + an Access Point. The Access Point creates a wireless network. The other end is a client.

Some wireless routers can be turned into a wireless bridge, which is a client that feeds a network. WRT54G and others.

Google:
dd-wrt
open wrt
sveasoft
open source firmware