Nissan Altima 2.5 S, i disconnected the dvd i had connected last year.... i disconnected the plug (passenger airbag) thats on the bottom from were the air condition controls are.... and i took off driverside belt from the wall but didnt disconnect no plugs......now that i have took off dvd and put back everything.... i turn on car and airbag is flashing...... please help.... what can i do..... so the airbag flashing light can come off...

thank you for helping

Here's a site that will explain everything you need to know about airbag lights and resetting the system.
http://www.airbagsolutions.com/

This website gives you the procedure for diagnosing and resetting airbag lights. See if your car is listed here. Although it’s a pay site ($14.95/day), it’s a lot cheaper than going to the dealer
http://www.airbagsolutions.com/vehicles_list.aspx

On most vehicles, the airbag light should come on for @6 seconds, and then go off if the system is working properly. If there is a fault or a problem in the system, the light will remain illuminated, or flash continuously. If the airbag light does not work properly, some vehicles have an audible tone that sounds indicating a problem with the airbag light system. When the light is on (or the tone is sounding), the airbag will NOT deploy, even in an accident.
The flashing light on your car is telling the answer you need. On some vehicles, the light is flashing a two digit code. Once you know the code, you can most likely repair it yourself. There are fairly easy procedures that most people are capable of repairing.
Airbagsolutions.com has the fault code charts to tell you what is wrong and how to fix it!

Some vehicle manufacturers accommodate systems without a scanner (like Toyota, Lexus, Nissan, Infinity, Honda, Acura, Ford, Lincoln, Mazda & Mercury) and some require a scan tool.

Check out these websites also for more info on airbag systems and the light.
http://blog.airbagsolutions.com/archive/2007/11/18/why-is-my-airbag-light-on.what-should-i-do.aspx

Lastly, check your vehicle for recalls through this link also:
http://www.airbagsolutions.com/nhtsa.aspx