6 wk old kitten lost use of back legs

Please Help! one of my little angels seems to have lost use of his back legs. They can still move, but he can't control them anymore, he just sorta drags them. He was fine yesterday, and I can't seem to find any swelling or sore spots. His feet  are normal temperature, and he seems slightly playful and still eats. I am worried sick about my little guy, never had this happen with kittens before. I can't afford a vet, we are down to pennies as is, but I want to help my little guy. Please, if you know what this might be, let me know.

http://answers.yahoo.com/question/index?qid=20080518204236AAjdQsU      there's a lot of reasons that could be the cause of this, this link has quite a few from other people who've had the same problems with their cats. the only way to know what it is for sure is to go to the vet though

Unfortunately, there is no way to try to diagnose via the internet, even if we were Vets, which we aren't. 

And it could be a few different things, some of them not too good.  I know you said you can't afford a Vet, so maybe you can find some help in this thread:  http://www.thecatsite.com/t/155462/cant-afford-a-vet-please-read