New...Question...Buttons/MC's....Thanks for the Patience

Ok. I have been reading thread after thread trying to figure out how to do this, and I’m sleepy, so my patience is thin! OH PLEASE HELP!!!
I have a button. Wanting to add a movie clip to the “over” frame.
I have read that I can just create another layer and bring the movie over to the stage and it should work…it doesn’t…I can’t figure out why.
Do I need to add A.S. to it?

I even tried creating a MC and letting that just act as the “button” but I can’t get the MC to wait until the mouse is over it to start! I did add A.S. to that one (from one of the threads on here)

You guys are really awesome!
Maybe one day I’ll be as cool as you!:drool:
Thanks in advance!