[FLASHCS3] MC follow cursor in given area

programming flash
1

what i want to happen is have images in a movie clip scroll up and down but i don’t want to have to move the mouse to the top of the page to see the top image

here is my code so far

frame 1:

if (_root._ymouse > _root.circle._y) {
_root.circle._y = (_root.circle._y + 10);
} else {
_root.circle._y = (_root.circle._y - 10);
}

frame 2:
if (_root._ymouse > _root.circle._y) {
_root.circle._y = (_root.circle._y + 10);
} else {
_root.circle._y = (_root.circle._y - 10);
}
gotoAndPlay (1);