with my two previouse post what i would like to do is make a script were on a critical hit (when attacking with the Hand To hand skill) my charactor will absorb health from my target. im trying to set the amount of of health absorbed to 50% of what ever the damage total is. i was figureing on a 1%-5% chance on the crital hit

Your best bet is to set an OnHit event handler with OBSE, filtered so that it checks that the attacker has no weapons equipped (GetEquippedObject 16 == 0) and that he is not casting a spell (AnimPathIncludes "cast" == 0, if I remember right)
http://www.tesnexus.com/downloads/file.php?id=36374 which adds elemental effects to punches using that method, you can look into it and reverse engineer it to suit your needs if you feel up to it.