What to use in place of delete this.onEnterFrame?

1

I have some code which is set to move an mc after a delay of 3 seconds. Problem I am having is when used like this, it of course keeps going because I am not telling it to stop:

function move(){
	clearInterval(moveInterval);
	_root.bottom.onEnterFrame = function() {
            _root.bottom._y += 5;
}
}
moveinterval =setInterval(move,3000);

So, I try using delete onEnterFrame once the clip reaches a y position of 636, but rather than having the smooth transition to this point, it simply jumps to it.

function move(){
	clearInterval(moveInterval);
	_root.bottom.onEnterFrame = function() {
            _root.bottom._y += 5;
			 if (_root.bottom._y = 636) {
		             delete this.onEnterFrame;
        }
}
}
moveinterval =setInterval(move,3000);

So I see that this is obviously killing the movement of the mc

(_root.bottom._y += 5;)

But I am not sure how else to approach keeping the movement going but stopping it once _y = 636;

I tried this to, with the same result:

function move(){
	clearInterval(moveInterval);
	_root.bottom.onEnterFrame = function() {
            _root.bottom._y += 5;
			 if (_root.bottom._y = 636) {
				 _root.bottom.stop();
        }
}
}
moveinterval =setInterval(move,3000);

I have looked through forums, have not found any answers or even a hint as to how I would handle this.