Mouse over problem in movie clip button

hello every one

i am new to flash 8. my problem is that i have a movie clip button that resides on a vertical rectangle and what i need to do is that whenever the mouse is over that vertical rectangle this button should follow the mouse pointer(up and down direction only) and the button resumes its original position whne the pointer is out of the vertical rectangle’s boundary.

i have used the rewind and roll over/out functions for that but its not working, can anyone help me regarding this problem

thanx in advance