Mc.onLoad = function

look at this code, what’s wrong?
_parent.unit[‘bullet’+openbullet].onLoad = bulletload;
function bulletload() {
this.range = 5;
trace(“LOAD”);
}

my mc.enterfame works but this doesn’t. I think it’s because it’s on load and for this to be implemented it has to be called after load so how do i use it? I tried to call it on the original but it didn’t work.