I have a linksys wireless router connected to a modem. I use this wireless network for my macbook . Is there anyway I can use my macbook/network to connect my Direct TV HD receiver to the internet (which is in a seperate room than the modem) so that I can stream on demand movies on my TV ?

If not , what's the cheapest / most practical way to be able to watch tv on demand from my tv (which requires internet conn).