Battery Backwards. Any Ideas?

Hello,
My '95 Integra's battery died. We bought a new one. Instead of a 51R, they gave us a 51, which has the terminals on the opposite side. We didn't notice until we touched the + cable to the - terminal, and sparks flew.

Now, the car does not start. The horn works, but headlights and other electronics do not. Is it possible that we just blew a fuse, or is it likely to be something more expensive, like the computer?

I checked the inside fuses, and I am about to go check the under-hood ones. Is there anything else relatively easily replacable that I can test?

A very small mistake is going to end up being very expensive if I need to get the car towed to a garage. Any suggestions? Please help!

Thanks in advance.

okay going to just ask. what do you mean by not start.... turn the key nothing happens. no noise, started ingaging??? stuff like that... check all the fuses though.

yeah, you probably popped a lot of fuses...better check them all. under the hood, as well as under the dash

yeah, you probably popped a lot of fuses

Well, I replaced the battery fuse (100A), and that appears to be the only thing that I fried. Thank goodness that the ECU is okay!

The clamps are a little loose on the posts of the new battery. That seems pretty problematic... I know that there shouldn't be any tension on those cables, but I'm worried about corrosion and arcing if they did work themselves loose. I guess I'll try to bend them in, because it seems tacky to just jam some wire in between.