2002 Honda Accord

Electrical problem
2002 Honda Accord 6 cyl Two Wheel Drive Automatic 105023 miles

Recently my battery cable came off and made my radio and car not work I put it back on. Today I was driving to work and when I turned my car off the car alarm went off. Not sure why but I started the car back on so it would go off and it didn't. The only way I could get it to go off is by disconnecting my battery. Now my keyless entry hasn't been working but I just thought the battery in it was dead. Now when I reconnect the battery the alarm starts going off again what can I do make it go out?
September 28, 2008.

Nevermind I got it, I pulled the fuse for the horn and was able to work on it without the horning going off in the parking lot, then I finally got my keyless entry to turn it off. Thanks for all the would have been help.

Sep 28, 2008.