If the wheel and tire are in good condition, but you broke the seal, I can tell you how to fix it. It's actually pretty easy to do.
Here's what you need:
A piece of rope
Big screwdriver or other metal pole, ~1-1.5 feet long
Air tank with a good bit of pressure; about 100 pounds or so
Either jack up the car, or pull it and work it elsewhere. Once the weight is off the tire, tie the rope around it as tight as you can with a secure knot. THen use the screwdriver to tiwst it so that the center of the circumfrance has a significan't bow to it. Wiggle it around to help it seat a little better. Then with as much pressure as you can get, inflate the tire until it holds air without leaking(should only take a short blast) You ay need to wiggle it more at this point. If you can't get it to go on, try tightening a little more and wiggling some more and repeat inflation stuff. Ho[efully that will do it for you. I've done it a few times and it worked quite well with a little persistance.
Edit: I've done this on two different trailers, a hand-truck, and even the tire off of a suburban.