I am trying to remodel my garage into an extra room and want to put in a toilet. I am on sewer NOT septic. I was told that there is such a toilet that churns solids into liquids,flows uphill and can go through a smaller pipe.If so, where can I find one ?

They are called macerating toilets. A macerator looks very much like a standard toilet and occupies about the same amount of floor space. But instead of draining the flushed water down into the floor, the system transports it through a pump contained in a small box, typically located behind the toilet and against the wall. Much like a garbage disposal, the system uses a spinning “maceratingâ€� blade that liquefies the solid waste. The liquid waste is then forced through the discharge pipes by the pressure of the pump. The discharge pipes tie into the soil stack and voilà! – you have a fully operational flushing toilet with no need to tear up the concrete slab. While the macerating toilets do cost more than a conventional toilet, $600+, the money saved over a conventional plumbing installation easily justifies the cost. Saniflo makes a number of examples. Any good plumbing supplier can get one.

Outstanding description by ma0641. Since I can't improve on it let me add a bit to it.
You are looking at a Saniflow system,(see image). Check it out at: Installation of pumps, grinders, and toilets for the home | SFA (http://www.saniflo.com/?utm_source=yahoo&utm_medium=cpc&utm_term=brand-general&utm_campaign=awareness)
Good luck, Tom

Speedball, amazing what you can do with cut and paste!