onclipEvent (enterFrame) {
_x = _xmouse;
_y = _ymouse;
}
_y and _ymouse are the same as _x and _xmouse, only the operators represent the y (vertical) position as measured in pixels from the top edge of the stage.
Now, the moment that each frame loads, Flash checks the x and y coordinates of the mouse cursor, and matches the position of the custom cursor to it.
