A bug or not?

A strange bug-like thing happens when I write:


onClipEvent (enterFrame) {
	for (i=0; i<25; i++)
	{this._x = i;
		}
}

I expect i to grow by one after every frame, but it just grows to 25 (or any other number) in one step :crazy: . And if I write this._x += i; it just makes the _x grow by 25 every frame and never stops :crazy: :crazy:
Any ideas?