I have an iPhone 3GS and I have recently downloaded the new netflix app that actually lets you watch the instant movies on your phone, well i then thought that with a set of the av cables I should be able to hook it up to a tv so I could watch them fullscreen. Well that's not happening, do these cable only work when you watch YouTube? I had the impression that it would just project whatever was on the phone onto the tv? The cables are not an apple brand, didn't feel like poking out over $50 for them so I picked up a set for $18 on e eBay. Is it just the cables? Do genuine cables from apple work this way?