Connecting router to a wireless network

Hi Forum.

In my home I'm currenlty using AT&T UVERSE wireless router which works great for the two computers in the house.

However, I have just bought a franchise which will require me to set-up a office in a detached garage.

I need to network two computers using a Linksys EhterFast Cable/DSL router with 4 port switch. So I would like to connect this router to my wireless in my home since it would be impossible to run a hard wire.

Thanks for the help!