Horizontal menu bar

1

Ok so I got this menu bar which is simply a horizontal bar, and I have it
folowing the mouse on the vertical axis, which all works fine.

However, I ned it to stop at a certain point at the top of the movie,
and a certain point at the bottom of the movie.

Also I need it to stop when the mouse is ontop of the movieclip.

Any Ideas?

Here is the code i am using.

onClipEvent (enterFrame) {
//y movement
 my=_root._ymouse;
 if (my<_y) {
 dy=_y-my;
 }
 else {
 dy=my-_y;
 }
 moveSpeedy=dy/15;
 if (my<_y) {
 _y=_y-moveSpeedy;
 }
 else {
 _y=_y+moveSpeedy;
 }
}

Thanks in advance.