I am a complete newbie so please respond in kind.

 I have the Slingbox Classic and AT&T Uverse for wired/wireless internet, tv plus DVR.  I had my Slingbox hooked up to the living room TV where the main internet modem is, but due to a tv hog roomate decided to move the dvr cable box up to my bedroom.  It worked wonderfully in this original configuration.  Of course i want to use Slingbox to watch my recorded shows, so his is necessary.  There is only one cat-5 run in the bedroom and it hooks into the AT&T cable box.  (AT&T boxes can take cat-5 or coaxial and they are interchangeable, but there is still just one cable that currently has a cat-5 adapter to coaxial cable.)  Since I not only need to hook up the Slingbox into the AT&T box and the internet, how do I do this without spending a ton more money?  Do they make cat-5 splitters like they do for phone lines?  Will it work?