OK, you've done your homework. So I'll repeat what I said up top. The alarm system by itself should not be draining your battery in just a week'* time. There must be some reason that it (or something else) is draining you battery like that.
I am not very versed in electrical diagnosis, but I do know that someone (you or an auto electric repair shop) will have to determine which system is drawing power (current flow) while the key is off.
For starters, is there or has there recently been any electrical issues that have been noticed or repaired? This will sometimes give you a clue as to where you should start looking. Are there any aftermarket accessories?
Bear with me while I ask these simple questions, especially if you have already passed these and are way ahead of us. To help in any way, we are going to have to know the basics of what'* going on first.
Mike: 1997 SE w/ 183K, aka White Horse
, Gutted Airbox w/K&N, drilled 180* t-stat, tint all around, clear corners w/SilverStars, "PONTIAC" light up tail, PEMs, NGK TR55s