Joy,
Are you saying that there is no spark at the spark plugs or your husband knows for certain that it is a bad coil? How did he varify this fact? Does he have a digital volt ohmeter (DVM)? One would be required to do any further checking of the ignition system. If you do not have access to a DVM the only thing you can do is check for loose conections to the distributor. Does the engine even sputter when you try to start it like it is trying to start?
I may have given you some misinformation previously. I forgot to mention that when checking for spark at the plugs the old fashion way, (taking each plug out of the cylinder head and then putting it back in the plug wire) you have to ground the plug on some bare metal piece of the engine while someone cranks it over. That's another reason that one of these spark plug checking devices that goes between the plug and the plug wire while the plug is still screwed in to the cylinder head and lights up if it is firing is a good idea.
Other quick things he can check for without any special tools if he knows the plugs are not getting spark is to remove the distributor cap (leave the plug wires attached to avoid any mixups) and check for evidence of cracks and therefore arcing of the electrical current on the underside of the cap. 2 screws need to be removed to remove the cap. While the cap is off, also pull the rotor off of the distributor shaft and look for evidence of cracking on both the top and bottom of the rotor. It just pulls off the shaft. I had an old Volkswagon Beetle many years ago where the underside of the rotor was cracked and it would ground itself out on the distributor shaft itself instead of transferring the current to each of the terminals on the bottom of the distributor. It took me a while to figure that simple problem out.
I would also suggest that if your husband is to do further checks with a DVM that you purchase a Haynes or Chilton manual for your year Camry. You may also be able to get one at your local library. Most libraries carry them. The Dewey Decimal code for automotive repair manuals is 629.2.
Let us know what is happening and we may be able to help.
Mike